What is the fine-grained topic of the following text: Carlson and an elite fighting force-the 2nd Raider Battalion-embarked upon a thirty-day mission behind enemy lines where they disrupted Japanese supplies, inflicted a string of defeats on the enemy in open combat, and gathered invaluable intelligence on Japanese operations on Guadalcanal. Only return the topic.
Carlson's 2nd Raider Battalion's mission behind Japanese lines on Guadalcanal