Joining the Legion
To join the Imperial Legion, travel to the city of Solitude in the north-west of Skyrim and speak to General Tullius. He’ll remember you from the Imperial fort when you were brought in as a captive before the dragon attacked.
He will tell you to talk to Legate Rike, his second in command.She decides , before letting you join the legion se wants to test your abilitys. She then followes through and tells you to go to Fort Hraggstad] to the west of Solitude and eliminate the bandits who now inhabit it.
This quest requires that you eliminate every bandit in the fort, including the few who are outside. There are two interior areas that have bandits and a few bowmen positioned inside. If you kill several of them and still haven’t completed the quest, you should see quest markers to every surviving bandit.
When all the bandits are dead, return to Legate Rike in Solitude. She will congratulate you and send you back to General Tullius. He will then ask you to swear the oath of the Imperial Legion. Once you do this and you have officially joined the Legion. You carry the starting rank of Auxiliary. Tullius will direct you to the blacksmith to be issued with legion armor.