Before King Leon and the army marched from Jaagarmouth Stronghold, Anne and her team were already moving out and infiltrated near the Udrary's Galbury Fortress. She and her team are the ones that launch the new version of [Chain Bomb] at the Galbury Fortress.
Udrary may not belong to the four big nations in the region and didn't have any seventh-grade combatants. However, their forces are troublesome, especially their beast riders.
In fact, Udrary's forces have better power regarding mid-level combatants compared to Heart Kingdom. This is also why the Heart Kingdom could never fully invade this kingdom properly.
Unless King Leon moves down by himself, the Heart Kingdom will never be able to easily break the Galbury Fortress in a short time. Moreover, the Udrary kingdom has close ties with Nergal, which makes King Leon unable to move without risking getting invaded by Nergal.
