Battle of Fort Duquesne This battle occurred during September of 1758. Around 842 English soldiers were given orders to patrol the Fort Duquesne region to attempt to learn of the "Supposed" French plans for protecting their fortification, but they accidentally got into a major battle with the Anishinabek and other Indian allies. The victorious Anishinabek inflicted 312 casualties (270 were killed) on the English.