Possible Clues:

• Just listen to how one may join forces
• One has an inclination at last to join forces
• Become of service, perhaps, to make 26 down
• Join up, being silent
• As it is during Lent, join forces with it
• Leaderless men have an inclination to join up
• Come in force and listen to this
• Legal caution
• Come into force?
• That will make one listen to orders