Federation troops and Zeon forces carry out a fierce battle in the Thunderbolt Sector in what was once Side 4 "Moore." The Thunderbolt Sector is a shoal zone composed of the debris of destroyed space colonies, named for the electrical discharges from the metal debris. MS pilot Io Flemming is among the Federation soldiers who are dispatched to the area, where Zeon sniper Daryl Lorenz awaits them on the battlefield. (Source: Gundam Wikia)
9Anime is the best site to watch
Mobile Suit Gundam Thunderbolt: December Sky SUB online, or you can even watch
Mobile Suit Gundam Thunderbolt: December Sky DUB in HD quality. You can also find
Sunrise anime on 9Anime website.