On December 22 in 1972, Kien Hung commune, former Ha Dong town was flattened by 72 bombs dropped by US’s B52 bombers, killing 80 people. There is still a memorial relief with the phrase "The crimes of the American enemy will never be forgotten" nowadays in Kien Hung ward (Ha Dong district).

On the occasion of the 90^th founding anniversary of the Party Committee of Hanoi (March 17, 1930 - March 17, 2020), Ha Dong district had placed a plaque to commemorate the event and praise the locals’ bravery during revolutionary war.

The memorial relief was erected in 1981 in a 423.6 sqm piece of land. In 2008, this memorial relief underwent restoration by the People's Committee of Kien Hung commune on the basis of keeping the original architectural state. 

The historical commemorating plaque reads: “At 5:50 a.m. on December 22, 1972, the American B52 bombers dropped 72 bombs to kill people and destroy Mau Luong and Da Sy villages, Kien Hung commune, Ha Dong town” (present Kien Hung ward of Ha Dong district).

The US Air Force attack left serious consequences and great losses of people and materials for Kien Hung commune. The US air raids killed 80 civilians, including 56 children. The memorial relief was built to show mourning for those innocent victims of the war.

Being approved by Hanoi authorities, the historical work had been completely restored and attached a plaque recognizing as a historical relic in March 17, 2020.