The summary is:
Markiplier plays Totally Accurate Battle Simulator and tries different strategies to defeat his enemies, such as barrel rollers, spearmen, archers and head-butters. He comments on the game's physics, graphics and humor, and reacts to his successes and failures. He also interacts with his stream audience and makes jokes about his military planning skills.
Here are the key facts extracted from the text:
1. The text is a transcript of a video by Markiplier, a popular YouTube gamer, playing Totally Accurate Battle Simulator.
2. Markiplier tries different strategies and units to defeat his enemies in various levels of the game, such as barrel rollers, spearmen, samurai, archers and head-butters.
3. Markiplier encounters technical difficulties with his stream and his game, such as lag, glitches and errors.
4. Markiplier makes humorous comments, noises and reactions throughout the video, such as laughing, singing, mocking and swearing.
5. Markiplier eventually wins most of the levels he plays, except for the last one where he faces head-butters and axers.