The Squall Gate

The Squall Gate is a small gate in Solitude Hold which stands just in front of the Storm Gate.

The Squall Gate consist of a small gate, tower and a wall.

The Squall Gate is said to be the place where enemies meet their first real resistance.

Source
Walking the World, vol XI

Characters
There is a Guard near the gate, who can tell you where to go if you wish to join the Imperial Legion.

Trivia

 * Despite being said to be the first real resistance, during the siege of Solitude there is not a single Imperial Soldier fighting.

Appearances

 * The Elder Scrolls V: Skyrim