Battle Pages/Vale Huntsmen vs. Breach Grimm

"Huntsmen vs. Grimm" is a battle that occurred between the combined forces of teams RWBY, JNPR, and CFVY, as well as professors Peter Port, Bartholomew Oobleck, and Glynda Goodwitch. They are also assisted by Emerald Sustrai and Mercury Black.

Preceding Events
In the lead-up to the battle, Team RWBY and Professor Oobleck uncovered a White Fang plot to lead large numbers of Grimm from Mountain Glenn into the city limits of Vale by using a train laden with explosives. Despite overcoming most of the train's defenders, including many White Fang soldiers, a number of Atlesian Paladins and Roman Torchwick himself, RWBY was unable to prevent the bomb-laden train from reaching Vale.

The resulting explosion exposed a large gap in the tunnel network under Vale, allowing numerous deadly Grimm to enter the city and wreak havoc.

The Fight
Having survived the explosion, RWBY finds themselves entirely surrounded by numerous Grimm, including Beowolves, Creeps, and a large King Taijitu. Quickly springing into action, the team began making short work of the assembled lower-level Grimm.

JNPR then joined the battle, heralded by Nora's dynamic entry, smashing the King Taijitu's head with her hammer, instantly killing the beast. Ren and Nora continue to thin the ranks of the Creeps and Beowolves, while Jaune confronts and manages to defeat an Ursa Major, much to Pyrrha's delight.

Neptune Vasilias and Sun Wukong make an ineffectual display of 'helping,' flashing their Junior Detective badges, but are immediately upstaged by the Atlesian Military, who deploy their airfleet, from which platoons of android soldiers are airdropped and begin to battle the Grimm.

Subsequently, Cinder Fall, Mercury Black and Emerald Sustrai join the battle, followed closely by Zwei, who emerges from the underground tunnels, and finally Professor Port and CFVY, who arrive together via a Bullhead. The new arrivals continue to clear out the masses of Grimm without much difficulty. Notably, Coco effortlessly destroys a Death Stalker and three Nevermores with her gatling gun.

Professor Port and Doctor Oobleck clear a street of Boarbatusk, Creeps and Beowolves, before Glynda Goodwitch uses her telekinesis to seal off the breach, ending the battle.

In the aftermath, Roman Torchwick is seen being 'arrested' by Emerald and Mercury and handed off to the Atlesian military's custody while the other participants celebrate the victory.

Trivia

 * Sun Wukong, Neptune Vasilias, and Cinder Fall were all present during the fight, but they aren't shown actively participating.