Instruct: Classify the given Amazon review as either positive or negative.
Query: The rise of Moscow

A fascinating account of the Russian military from their defeats to the Mongols in 1250 to 1500. This was a period when the Russians engaged in a war on two fronts. To the West were the German crusaders and in the East were the Mongols.During this period, siege warfare became more important. The Russians improved their military both in size and quality. In technology, their equipment kept up with the West. The Russians quickly adopted crossbows and then guns. Slowly the Russians threw off the Mongols and established a state centered on Moscow.