Mr Drawbridge was so mad about the groundhog problem he thought he had, that instead of smoke bombs he had bought dynamite. Cinderella had been at the grain elevator when he came in spluttering about the big pile of dirt behind his corn crib. She began putting two and two together and once again it added up to four. She heard him saying he would put the dynamite in the corn crib until he could get permission from the fire department to blow up the groundhogs.