Which battlegrounds are in Wrath of the Lich King Classic?

Warsong Gulch, Arathi Basin, Alterac Valley, Eye of the Storm, Strand of the Ancients, Isle of Conquest.

How do I join a battleground?

Talk to a battlemaster in a capital city or use the battleground's entrance.

Choose a battleground: how to win, its map and objectives, how to get there and what its reputation rewards.

Battleground	Levels	Team	How to win
Warsong Gulch	10–80	10	The first team to capture the flag three times wins.
Arathi Basin	20–80	15	The first team to gather 2,000 resources wins.
Alterac Valley	51–80	40	Killing the enemy general wins the battle.
Eye of the Storm	61–80	15	The first team to 2,000 victory points wins.
Strand of the AncientsNew	71–80	15	Each team attacks for one round of up to ten minutes. The team that captures the relic faster, or the only one to capture it, wins.
Isle of ConquestNew	71–80	40	Each side starts with 300 reinforcements; a team wins when the enemy runs out or its commander falls.

Which battlegrounds are in Wrath of the Lich King Classic?: Warsong Gulch, Arathi Basin, Alterac Valley, Eye of the Storm, Strand of the Ancients, Isle of Conquest.
How do I join a battleground?: Talk to a battlemaster in a capital city or use the battleground's entrance.