Prosecutors in the criminal trial of Dewey & LeBoeuf’s three top executives—former firm chairman Steven Davis, onetime executive director Stephen DiCarmine and former chief financial officer Joel Sanders—hit their stride for the first time Thursday in questioning a well-liked retired partner and former executive committee member.

Jane Boisseau testified that the firm used her $621,000 in equity capital in 2010 to offset expenses, violating its partnership agreement, and broke a written promise to repay a capital loan that it encouraged her to take.