From January 21 through 25, 1864 Union forces conducted a reconnaissance of Confederate defenses on Matagorda Peninsula in Texas, landing near Pass Cavallo and spending the first two days marching through the marshland and lowlands of the peninsula.
On the third day Federal forces captured a number of horses belonging to Confederate sentries who fled in the face of the approaching enemy. The Federal incursion continued until a substantial force of Confederates were discovered encamped near the mouth of the Caney River. Union forces then were evacuated by the Union Navy.
The only casualties were a captain and private who were struck by the same, errant shot from the USS Sciota which killed the captain and severely wounded the private; apparently no Confederates were killed or wounded during the Union reconnaissance.