sentences:  Schwartz commanded 200 Swiss mercenaries in the campaign.When John de la Pole, 1st Earl of Lincoln fled the English court, having decided to promote the cause of the pretender Simnel, his aunt, Margaret, Duchess of Burgundy, contracted Martin Schwartz to provide 2,000 troops for an invasion.Both Lincoln and Schwartz died at the Battle of Stoke Field, when this invasion force was defeated by the army of Henry Tudor.