abstract
| - In 1610, in response to the Polish advance on Russia, Russians and Swedes formed an alliance, and launched an operation known as the De la Gardie Campaign. A Russian army under Prince Dmitry Shuisky was heading towards the besieged fortress of Smolensk, but was intercepted by Commonwealth forces. In the meantime, Shuisky divided his forces into several smaller units. The Commonwealth forces of about 12,000 under hetman Stanisław Żółkiewski encountered the advance Russian force of 8,000 under Grigory Valuyev and attempted to attack it soon after dawn on 24 June, but Russians were able to fortify their positions at Tsaryovo-Zaymishche camp. The Russian troops found themselves encircled and trapped in their camp, but the main force under Shuisky, of about 35,000, was only days away. Russia, however, did not know the real strength of the Commonwealth, and how greatly they outnumbered them. Further, the besieged advance unit failed to notify Shuisky that it has encountered the Polish-Lithuanian army. On the other hand, Żółkiewski was confident in his powerful hussars, and decided to press with the attack. On 3 July he decided to leave part of his forces besieging the camp, and take the most mobile units against Shuisky's troops. The ruse was successful, as the besieged troops never realized that the bulk of the Polish-Lithuanian army was temporarily engaged elsewhere, and neither was Shuisky aware of the Polish-Lithuanian movements nor expecting a major engagement.
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