In 1758, the Virginia Regiment was assigned to Britain's Forbes Expedition to take Fort Duquesne. Washington disagreed with General John Forbes' tactics and chosen route. Forbes nevertheless made Washington a brevet brigadier general and gave him command of one of the three brigades that would assault the fort. The French abandoned the fort and the valley before the assault was launched; Washington saw only a friendly-fire incident which left 14 dead and 26 injured. The war lasted another four years, but Washington resigned his commission and returned to Mount Vernon.