Board Thread:TV Show Discussion/@comment-5014364-20160411185612/@comment-5014364-20160411193138

We've heard them alternatively call it "The Battle of Six Armies" - in mock comparison to the Hobbit's Battle of the Five Armies, which came out around the time they were filming.

From what I've been able to glean, the "six armies" are actually two sides, three "armies" each:
 * Bolton side:
 * Main Bolton army
 * Karstarks
 * Umbers


 * Anti-Bolton side:
 * Wildling army (seen in trailer)
 * All of the defeated Northern Houses that still oppose the Boltons scraping up what few troops they can, rallied behind Sansa and possibly Rickon - including Mormonts, Hornwoods, etc. So few from each that they count it as just one "army" altogether - may include the half of Stannis's army that fled, re-rallied by Davos.
 * probably the Vale army arriving late-battle (given that we know Littlefinger is invading the North)