Group A was almost completely destroyed by US bombs. According to locals, the massive A1, considered the most important monument at My Son, remained impervious to aerial bombing and was intentionally finished off by a helicopter-borne sapper team. All that remains today is a pile of collapsed brick walls. After the destruction of A1, Philippe Stern, an expert on Cham art, wrote a letter of protest to US president Nixon, who ordered US forces to stop damaging Cham monuments.
A1 was the only Cham sanctuary with two doors. One faced east, in the direction of the Hindu gods; the other faced west towards Groups B, C and D and the spirits of the ancestor kings reputedly buried there. Inside A1 is a stone altar. Among the ruins, some of the astonishingly precise brickwork (typical 10th-century style) is still visible. At the base of A1 on the side facing A10 (decorated in 9th-century style) is a carving of a small worshipping figure flanked by round columns, with a Javanese sea-monster god (kala-makara) above.