sentences:  Twenty-one ARVN soldiers from Battery B, 22nd Field Artillery, along with two 105mm howitzers, were on Mary Ann to support ARVN operations to the south.For months leading up to the attack the level of enemy activity in the area had been low and contacts were infrequent.The lack of significant recent engagements, along with preparations to turn the FSB over to ARVN units, had given the U.S. soldiers in the area a false sense of security.