The stronghold events have sections similar to the daily challenge. It's split into parts, easy, medium, hard, extra hard, with each part having more battles and maps than the last section. Rewards are set between the battles, gold, bots, energon, cores, etc, but you only get them when you complete each map page. When the game is running properly the stronghold event is all bot battles, and events like the one we just finished are against other players. Everything now is against bots because the devs are fixing the game.