The factors that contributed to the French forces' victory at Fort Duquesne during the French and Indian War included several elements. Among the options you provided:
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The British troops were split in their loyalties between Braddock and Washington: This may have contributed to some level of confusion but is less emphasized as a primary reason.
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The French outnumbered the British: While troop strength is always a factor in military engagements, the actual dynamics at Fort Duquesne involved the effectiveness of the forces and tactical decisions, rather than just numbers alone.
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The French used guerrilla warfare tactics and ambushed the British: This is often cited as a significant factor. The French and their Native American allies employed guerrilla tactics, including ambushes and hit-and-run attacks, which exploited the British army’s more traditional and less flexible formations.
Overall, the third option regarding guerrilla warfare tactics was a crucial determinant of the French victory at Fort Duquesne.