Not only marriages, DDtanks also allow players to have their own leagues. The players in DDtank are at will to start their league or join the league of someone else that had sent an invitation. This is similar to the coop farming jobs that are being done in Farmville that is also a browser game like DDtank. That ddtank game is available in facebook and also in twitter and the strategies are purely based on farming. In DDTank though the main theme differs the concept remains the same. Players can create their leagues when they reach a level of 5 by paying 50000gold coins.
He or she can also become the chairman of the league as he or she was the one who founded the league. You should enter the name of your league in the ddtank prescribed message box upon satisfying both the requirements. If you wish to join another league then there is also an option to do that. Choose the leagues that are active from the drop down list and send an invitation to join that league. If you have got an invitation from your friend then you can join the league using that invitation too. The chairman of the league you have applied for should accept you.