The cavalry that appeared on the battlefield was the Shock Cavalry formed from Allen's Heavy Cavalry and the Dúnedain Rangers.
Under Adrahil's guidance, they had finally reached the battlefield at the crucial moment.
In fact, Allen's and Círdan's forces had arrived near Pelargir shortly after Antonis's reinforcements joined the battle.
Although Klethi's animal companion had been extremely reluctant to approach the Witch-king of Angmar, it had still brought back some information about the battlefield.
After a brief discussion of the intelligence they had received, Círdan and Allen had prepared to attack Angmar's army from both front and rear.
At the time, Angmar and the seemingly endless ranks of Half-orcs had remained in place, while the humans were gradually gaining the upper hand in the fighting beneath the walls.
Allen and Círdan still had some time to devise a better battle plan.
Yet the situation changed in an instant when Angmar unleashed a scream with all his might. The humans were once again in grave danger, and flames even began rising within the city.
Allen could not stand by and watch those brave human soldiers fall to the Half-orcs under the enemy's evil magic.
Nor did he want to arrive here in desperate haste only to save a city already trampled by Half-orcs.
So Allen decided not to wait for word from Círdan. At the most critical moment, he had Aragorn, who stood beside him, sound the horn for the charge.
He led the Gryphon Cavalry around him toward Angmar. As they charged, Allen drew the gem-set Rune Bow glowing blue in his hand and aimed at the black horse beneath Angmar.
To bring down a rider, shoot his horse first; to defeat an army, seize its leader first.
Angmar, who had been advancing, keenly noticed this and instinctively slowed his