8 Times Asgard Went To War
2. War Of The Realms
The most recent war Asgard managed to come out of was 2019's War of the Realms. The War of the Realms was on a scale unheard of before, that even the long forgotten 10th realm of Heven got caught up in the war.
Beginning with his escape from Hel, Malekith went on to rally the Dark Elves of Svartalfheim, made deals with the Frost Giants of Jotunheim, the Fire Demons of Mulspelheim, the Roxxon Corporation of Midgard, the Angels of Heven, some trolls, Enchantress, and Loki. They kicked off the war by conquering Alfheim and the Light Elves, decimating Nidavellir (home of the Dwarves), and destroying Vanaheim, before finally setting his sights on Midgard, and the remains of Asgard following the events of the Death of the Mighty Thor.
And when Malekith's forces attacked, they went all out from the get go. After taking control of New York, Malekith and his allies created strongholds on each of the Earth's continents. It took the combined might of Asgard, the Avengers, the Agents of Atlas and the Fantastic Four just to keep Malekith from conquering everything.
The War of the Realms finally ended after we witnessed Jane Foster's Mighty Thor, Old King Thor, Young Thor, and present day Thor - with a newly reforged Mjolnir - defeat a symbiote wearing Malekith at Stonehenge.