We don't know yet either. We assume we'll get some more about that in the next chapter.
The only possible way we can think of is if an Earth ship fired on the first Gamilas ship to enter the Solar System prior to the war starting. Otherwise it could be Gamilas propaganda so their forces think they are defending instead of attacking. Mind you that until Yamato, Earth had no known Faster Than Light ships to even leave the Solar System.
Judging by the previews, we will get some information of earlier in the war via flashback. Either Shima's father's ship, or the assistant chief engineer's ship (a cruiser) getting attacked sometime in the past.
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