enlisting them int he cause..

"It is your problem no less than mine."
「我的難題也是你們的難題。」

enlist somebody in something = persuade somebody to help you or join you in doing something 設法贏取幫助

cause = 目標,理想,事業
at hand = close to you in time (當前) or distance (近)

他說：「我的難題也是你們的難題。」
遊說他們在當前的目標上幫助他。