Unit History

789th AAA Battalion

Original Unit History for the 789th Anti-Aircraft Artillery Battalion. Added to my collection as a gift from Wim Govaerts, Lier, Belgium

The 789th Anti-Aircraft Artillery Battalion (Semi-Mobile) was a United States Army unit activated in 1943 that served primarily in the European Theater of Operations during World War II, specializing in low-altitude air defense with 40mm Bofors guns against aircraft and V-1 flying bombs. Equipped as a semi-mobile battalion, it lacked full vehicular transport for rapid redeployment, often advancing in stages while providing protection for airfields, beaches, and key supply ports. The unit's service spanned training in the United States, initial deployment to England in May 1944, landings in Normandy in September 1944, and critical defensive roles in Belgium and Germany until demobilization in late 1945, with minimal casualties including one combat death and one non-combat death.

Following activation at Camp Stewart, Georgia, in 1943, the battalion underwent rigorous training across multiple U.S. sites, including maneuvers in the Okefenokee Swamp, winter duties at Richmond Army Air Base, Virginia, and final preparations at Camp Edwards, Massachusetts, before embarking from Southampton on May 13, 1944, aboard the SS John Ericsson as part of an 80-ship convoy to Liverpool, England.

In England from May to September 1944, it guarded fighter airfields housing P-51 Mustangs and P-47 Thunderbolts, achieving notable success in downing V-1 buzz bombs by anticipating launch patterns from German and Dutch sites based on Allied intelligence. Deployed to Normandy via Omaha and Utah Beaches in September 1944, the unit briefly defended beachheads and supply operations before advancing to Beerzel, Belgium, on November 10, 1944, where it joined the secretive 'Antwerp X' command under Brigadier General Clare H. Armstrong to protect the vital Port of Antwerp from German V-weapons. Positioned forward of the main defensive line in an arc southeast of Antwerp with the 788th AAA Battalion, the 789th focused on intercepting low-flying V-1s using 40mm guns, contributing to the overall downing of 2183 V-1s during the 175-day campaign from October 1944 to March 1945, though challenges like weather, ground clutter, and ammunition shortages limited effectiveness against the bomb's armored fuselage.

During the Battle of the Bulge starting December 16, 1944, the battalion was temporarily withdrawn from air defense to perform infantry duties, manning roadblocks and ridges near Liège while observing intense ground and air combat, including the downing of B-17 bombers by German 88mm guns and strafing runs by Focke-Wulf aircraft.

After the Ardennes, early 1945, the 789th returned to the Buzz-Bomb war around Antwerp, several of its gun positions being located near Lier, Belgium. The men were on duty around the clock, with alerts by day and by night as the bomb numbers increased. They entering Germany near Wesel before VE Day on May 8, 1945, for occupation duties before returning to Belgium and staging for demobilization from Marseille, France, in December 1945.

The battalion received post-war recognition, including awards from Belgian and Luxembourg authorities, for its role in safeguarding Allied logistics through Antwerp, which handled up to 22500 tons of cargo daily despite 4248 V-1 and 1712 V-2 attacks that caused limited but disruptive damage.

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