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We do know that Wallace was an experienced swordsman and knight, which indicates he may have fought in wars prior to his own rebellion and participation in the wars against the English. In fact, one possibility is he fought with King Edward I as a mercenary during that king's wars against the Welsh. That may have been the most feasible path for him to have gained fighting experience and possibly learn about English war tactics.<ref>For more on William Wallace the knight, see: Brown, C. (2005). <i>William Wallace: The True Story of Braveheart.</i> Stroud: Tempus.</ref>

In the movie, William Wallace began fighting against the English after the death of his wife in 1297, who according tot he movie was killed by the English. In fact, no records exist of William Wallace having ever been married. However, a later poem did mention he had a wife that was killed and it led him to seek revenge. More likely, Wallace was either ambitious to break English authority or resented English occupation of his ancestral lands. This may have been why he became one of the leading early Scottish rebels. Braveheart also suggests that Wallace's actions in response to his wife's death triggered to a wider rebellion against the English.