 About six hours later, the 2/1st Infantry, commanded by Lieutenant Colonel Robert B. Nelson, touched down at the camp and immediately set up defensive positions in support of Detachment A-105.Under constant enemy mortar and artillery attacks, U.S. and allied forces strengthened their defenses, as there were no significant ground probes on 10–11 May.Allied defenses at Khâm Đức remained thin and the PAVN occupied the surrounding high ground, where they could target allied ground targets and support aircraft with a high level of accuracy.