What tactics did jiang jieshi use in order to keep power out of the hands of the communists? he slaughtered communist party members and workers who supported them in an extermination campaign. he accepted foreign aid from western democracies and joined forces with chinese warlords. he treated peasants politely and ordered soldiers not to damage crops to win them to the nationalist side. he used guerilla or irregular hit-and-run tactics to fight the communists, forcing them to retreat to the south?