Clan battle

My name is mastermaheer in tanki online. My qouestion is that if 2 clans are ready to play clan battle so how to play that battle. My clan PG and the opponents clan B & B want to play a clan battle. I read how to play clan battle and formats of clan battle. but there is written sandbox with 4x4. Is this mean we can only play in sandbox if we have 4 players and there is written the game will be of 13 mins and after 3 mins it will start automatically and what to do if the match tie.