You may give troops to another player, or receive troops the same way. You use the Transfer Troops option on the Army Management menu. Simply go to the fief you want to leave the troops at, and enter the number of troops to be transferred. One thing to remember, however, is that the player picking up the troops cannot have more days left than the player transferring the troops (otherwise, the troops themselves could end up using more than 90 days in the season.) The player picking up the troops uses the Pick Up Transferred Troops option on the Army Management menu to get the troops. If troops are not picked up, there is a chance they will turn into brigands. Any time you transfer troops or pick them up it costs you (randomly) 10-30 days (because of the primitive Medieval communications.)