Fort de Cavagnial (also known as Fort Cavagnolle or Post of the Missouri or Fort de la Trinité) was a French fort on the Missouri River somewhere between Kansas City, Missouri and Fort Leavenworth, Kansas from 1744 until about 1764. a small but substantial fort with a surrounding stockade of stout piles and with bastions at each of the four stockade corners. Internal buildings included a commandant's house, a guardhouse, a powder house, a trader's house, and a house for the trader's employees. The buildings were constructed of logs and most were covered with mud.