Heavy Anti-aircraft battery 520m east of Holes Mouth


Heritage Category:
Scheduled Monument
List Entry Number:
Date first listed:


© Crown Copyright and database right 2021. All rights reserved. Ordnance Survey Licence number 100024900.
© British Crown and SeaZone Solutions Limited 2021. All rights reserved. Licence number 102006.006.
Use of this data is subject to Terms and Conditions.

The above map is for quick reference purposes only and may not be to scale. For a copy of the full scale map, please see the attached PDF - 1021291.pdf

The PDF will be generated from our live systems and may take a few minutes to download depending on how busy our servers are. We apologise for this delay.

This copy shows the entry on 22-Oct-2021 at 04:14:09.


The building or site itself may lie within the boundary of more than one authority.

City of Bristol (Unitary Authority)
Non Civil Parish
National Grid Reference:
ST 52425 80836

Reasons for Designation

Although of comparatively recent date, 20th century military sites are increasingly seen as historic survivals representing a defining episode in the history of warfare and of the century in general; as such they merit careful record and, in some cases, preservation. One of the more significant developments in the evolution of warfare during this period was the emergence of strategic bombing in World War II, and this significance was reflected by the resources invested in defence, both in terms of personnel and the sites on which they served. During the war, the number of people in Anti-aircraft Command reached a peak of 274,900 men, additional to the women soldiers of the ATS who served on gunsites from summer 1941, and the Home Guard who manned many sites later in the war. A national survey of England's Anti-aircraft provision, based on archive sources, has produced a detailed record of how many sites there were, where they were and what they looked like. It is also now known from a survey of aerial photographs how many of these survive. Anti-aircraft gunsites divide into three main types: those for heavy guns (HAA), light guns (LAA) and batteries for firing primitive unguided rockets (so called ZAA sites). In addition to gunsites, decoy targets were employed to deceive enemy bombers, while fighter command played a complementary and significant role. Following the end of World War II, 192 HAA sites were selected for post-war use as the Nucleus Force, which was finally closed in 1955. The HAA sites contained big guns with the function of engaging high flying strategic bombers, hence their location around the south and east coasts, and close to large cities and industrial and military targets. Of all the gunsites, these were the most substantially built. There were three main types: those for static guns (mostly 4.5 and 3.7 inch); those for 3.7 inch mobile guns; and sites accommodating 5.25 inch weapons. These were all distinct in fabric, though they could all occupy the same position at different dates, or simultaneously by accretion. As well as the four or eight gun emplacements, with their holdfast mountings for the guns, components will generally include operational buildings such as a command post, radar structures including the radar platform, on-site magazines for storing reserve ammunition, gun stores and generating huts, usually one of the standard Nissen hut designs. Domestic sites were also a feature of HAA gunsites, with huts, ablutions blocks, offices, stores and amenities drawn from a common pool of approved structures. Sites were often also provided with structures for their close defence; pillboxes are the most common survivals, though earthwork emplacements were also present. The layout of HAA gunsites was distinctive, but changed over time, for example to accommodate the introduction of radar from December 1940, women soldiers from summer 1941, and eight gun layouts from late 1942. Nearly 1,000 gunsites were built during World War II, and less than 200 of these have some remains surviving. However, at only around 60 sites are these remains thought sufficient to provide an understanding of their original form and function. This includes 30 of the 192 examples which continued in use until 1955. Surviving examples are therefore sufficiently rare to suggest that all 60 well preserved examples are of national importance.

Despite some damage to the concrete structures, the Heavy anti-aircraft battery at Rockingham Farm survives well, and represents the range of structures originally present. It follows the classic layout of this type of site, and all the expected elements including the command post at the centre of the arc of four gunpits, with the magazine to one side remain visible. It would appear that the site was abandoned in 1946, and, apart from the damage noted above, there is no evidence that there has been any intereference with the site since then. Therefore, it is thought that the survival and archaeological potential will be good. The site is classed as `near complete' in the gazetteer of HAA sites, one of only six such sites in the former county of Avon.

Apart from its intrinsic value, the Heavy Anti-aircraft battery 520m east of Holes Mouth forms part of a group of HAA emplacements defending Bristol and the Severn Estury. These include five other sites in the Bristol area, namely Lodge Farm, Portishead/Portbury, Gordano, Cribbs and Purdown. This group of sites were constructed to safeguard crucial elements in the defence of Britain against the threat of invasion during World War II, and it is in this context that the true importance of this battery can be recognised.


The monument includes a Heavy Anti-aircraft battery at Rockingham Farm, approximately 3km north of Avonmouth. The site lies a short distance from the coast and is bordered by a railway line on its west side and the A403 road on its east. To the south of the site are modern industrial units, and to the north an area of marsh.

The site comprises a command post, four octagonal gunpits and a magazine. The command post can be recognised, partially extant, as a rectangular concrete structure, about 3m by 8m, at the centre of a semicircle formed by the position of the gun pits. Earth banked against its sides is contemporary with its wartime use. Further earthwork irregularities covered by scrub growth are thought to be the remains of other parts of the command post. There are four octagonal gunpits forming a semicircle facing west, south west, north west and north. In three of the gunpits the central area is mounded with spoil and covered in vegetation, so that the condition of the concrete base and holdfast cannot be determined, but in the fourth, the centre of the gunpit is clear, and the concrete base appears to have been broken up. Iron hinges appear on the front segment of most of the gunpits, and all concrete sides stand to approximately 1.5m which appears to be their original height. No ammunition lockers could be seen, but may survive under the earth and vegetation. At the rear of the gunpits is the limber gunner's shelter, for gun maintenance or the gun detachment. Each gun emplacement is protected by an earth bank. Other pits to the rear of the gun arc may represent the position of Light Anti-aircraft guns. The magazine survives, although somewhat damaged, standing to approximately 2.5m high with iron reinforcing rods projecting from the concrete. Parts of the concrete wall have been demolished, and most of the roof removed, revealing the interior of the building. An entrance doglegs into a corridor from which five rooms open. The magazine is semi-sunken and protected by earth banks, with a space of about 0.6m between the concrete and the bank.

The site was operational from February 1940 until the end of the war. The battery was initially equipped with four 3.7 inch static guns, and had a GL Mk II radar by June 1942. The battery was reequipped with four 4.5 inch guns by January 1943. The latest documentary reference to the site, dated January 1946, suggested that the battery was decommissioned during that year.

MAP EXTRACT The site of the monument is shown on the attached map extract. It includes a 2 metre boundary around the archaeological features, considered to be essential for the monument's support and preservation.


The contents of this record have been generated from a legacy data system.

Legacy System number:
Legacy System:


Bristol CIty Council, BSMR 5972,
RAF, Rockingham HAA site 4/12/1946 RAF CPE/UK1869 Frame 3016, (1946)


This monument is scheduled under the Ancient Monuments and Archaeological Areas Act 1979 as amended as it appears to the Secretary of State to be of national importance. This entry is a copy, the original is held by the Department for Digital, Culture, Media and Sport.

End of official listing

Your Contributions

Do you know more about this entry?

The following information has been contributed by users volunteering for our Enriching The List project. For small corrections to the List Entry please see our Minor Amendments procedure.

The information and images below are the opinion of the contributor, are not part of the official entry and do not represent the official position of Historic England. We have not checked that the contributions below are factually accurate. Please see our terms and conditions. If you wish to report an issue with a contribution or have a question please email [email protected].