Not compliant, a punitive expedition under Col. Frank Baldwin set out to settle matters with the south-shore Moros. Although an excellent officer, Baldwin was "eager," and a worried Davis joined the expedition as an observer. On May 2, 1902, Baldwin's expedition attacked a Moro cotta (fortress) at the Battle of Pandapatan, also known as the Battle of Bayan. Pandapatan's defenses were unexpectedly strong, leading to 18 American casualties during the fighting. On the second day, the Americans used ladders and moat-bridging tools to break through the Moro fortifications, and a general slaughter of the Moro defenders followed.