Signy was with his unit, that had a few Earls from nearby kingdoms, he was their leader but only by name as he lacked sufficient experience to lead them but the Earls were not swords under his command and were given the liberty to act freely.
Signy was excited that this was his first taste of actual war and he knew that the expectations that were on his shoulders were high.
Most did not see him as a worthy successor to King Asmund and Signy knew should his father die, he would be trialed to a duel with potential challengers for the crown.
Men with far more powerful names and accomplishments than him so this was his chance to prove his name as the son of Asmund.
But nothing was going on, they had to defeat the forces of his father to reach them but that was highly unlikely because King Asmund was strong enough to defeat Erik unarmed despite being well past his prime, this only showed a fragment of his strength during his prime.