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Major battles of Klaxonian-Human conflict in order

Battle of Britain (2220).

The first true counter assualt against the Klaxonian armada was in Britain, who immediately after the UN bombing started deploying extra security forces around the country. This was a smart move as an hour later after the third world countries and Russia fell, the fleet of instant regret was sent to control Europe, and Britain was able to hold them off for 2 1/2 hours before they inevitably fell and evacuated everyone they could. They destroyed a total of 200 elite command military bots and 15000 reg. infantry military bots.
Human losses: 1,000,000
Human wounded: 150,000

The next major battle wouldn't happen for another 18 years.

The Panama Push (2238)

Humans controlled North America and it's air space and wanted to test it's new military program. (The ACAU) and sent 5 squads out to help ground forces get control of Central America. The humans were cocky, and as a result all 5 squads were taken out by either enemy bombs or enemy infantry. The push lasted 5 days and the humans were forced to retreat and in a Klaxonian counter push, were pushed back to Area 51. (Side note: civilians were kept in all areas except 51 to keep them safe from enemy bombardment) the Klaxonians lost 100 elite command infantry and 2000 regular robot infantry.

Human losses: 500,000, 5 ACAU squads.
Human wounded: 20,000.

Battle of instant regret (2238)

A covert ops mission carried out by Delta team to destroy the fleet of regret, which had held firm control of Europe since the war had started. And the Klaxonian fleet in the end was destroyed, but the remote detonator fried during the escape and Delta-3 gave his life to manually detonate the bomb. "Tell my kids dad says hello..." Were his last words to his team. The Klaxonians lost 1 fleet and an entire legion of soldiers.

Human losses: 1.

Battle of Area 51 (2238)

The battle of Area 51 was a direct result of the Panama Push, but also a turning point in the Klaxonian-Human war. After entrenching themselves at the facility, the remaining human forces called for reinforcements. 9 ACAU squads were dispatched, one of them being Delta team returning from Europe. The first Klaxonian push was about 1000 RIUs and all were destroyed. The next push was 100000 RIUs and 1000 EIUs. This is where most of the fighting was. On the second push Delta team dropped from 1000 feet to enter the battlefield. And about a half an hour after they touched down Delta-2 was killed after she saved Delta-1 from being choked to death by an elite infantry unit. She died telling Delta-1 she had his back. The Klaxonians lost 95% of the troops that participated in that battle.

Human losses: 14000, 34 ACAU personnel.
Human wounded: 1000

Operation interceptor (2238)

2 days after Area 51 the last of Delta team were sent to destroy a Klaxonian reinforcement vessel carrying 1000000 troops. The two got in no problem, dispatching the online guard units to get to the engines which when blown up would destroy the entire vessel. However they got separated on their way out by a guard surprise attack. They fought to the hangar where their small transport was and when they were about to be reunited Delta-4 got shot in the side several times by an EIU. Delta-1 killed the EIU and Delta-4 collapsed into his arms. "We've been through some tough times together eh, boss?" Were his last words. Delta-1 completed the mission and remote detonated the bombs. Destroying the transport.

Human losses: 1.

Battle of the mothership. (12/31/2238-1/1/2239)

The final battle of the Klaxonian-Human war, the humans found the mothership of the Klaxonian armada which housed all 2700 of the Klaxonian race. Their decision to attack was hurried because of the Klaxonian plot to blow up the sun. Delta-1 was deployed and ordered to wait for backup but he went in alone in order to stop the Klaxonians as soon as possible. In the end he succeeded and blew up the mothership. Killing the entire Klaxonian race and ending the war. However this came at a cost. He was unable to get out in time and was presumed dead.

Human losses: 1(MIA)

Honorable mention:
Antarctica+north pole. Not a battle but one of the reasons the loss of life in the war was so high. The Klaxonians melted the ice caps and raised sea levels. This drowned thousands.