With no explanation, label text_A→text_B with either "False" or "True".
text_A: In July, Kamtchatka declared war on Yakutsk. Since Yakutsk's army was much  better equipped and ten times larger, they were victorious within weeks. The they is more likely to refer to Yakutsk than Kamtchatka because Yakusk had a bigger and better army. Kamtchatka didn't. So Kamtchatka lost.
text_B: In "In July, Kamtchatka declared war on Yakutsk. Since Yakutsk's army was much  better equipped and ten times larger, they were victorious within weeks. ", The they is more likely to refer to Yakutsk than Kamtchatka because Yakusk had a bigger and better army. Kamtchatka didn't. So Kamtchatka lost.
True.