government and obligatory draft of free peasants. Early battles Thus the Commonwealth was forced to fight on two fronts, as its armies were also needed south to deal with the Moldavian Magnate Wars, and Swedish forces quickly gained 3:1 numerical superiority. In the beginning of the war, in 1600, although a Commonwealth army under Krzysztof Mikołaj "Piorun" Radziwiłł striking first was able to deal the Swedish forces several defeats in the open fields, Swedes took control not only of Estonia, but of most of Livonia, the Commonwealth territory south of Estonia (the entire region was known in Poland as Inflanty ()). The Polish parliament, the Sejm, reacted by increasing funds for the army and recalling forces and commanders from the southern front (deemed less important as most of that war took place outside Commonwealth territory) to the threatened north. In 1601 Lithuanian hetman Jan Karol Chodkiewicz and Polish chancellor Jan Zamoyski, recalled from Moldavia, arrived in Lithuania to fight the Swedish incursion, which now threatened not only the Estonia promised by Sigismund, but older Polish territories south of it. Chodkiewicz and Radziwiłł defeated the Swedes in the first major open battle of this war at Kokenhusen (modern Koknese) in early 1601 (see battle of Kokenhausen). Soon afterwards, Jan Zamoyski, fresh from his victory against the Moldavians, came in to help against the Swedes, with 12,000 men, and 50 artillery pieces, 15 of which were classified as heavy. Charles was unable to deal effectively with such an army and was forced to retreat. However, during the retreat he left sizable numbers of defenders at various captured fortresses in Livonia. Zamoyski now took to siege warfare instead of chasing the retreating King, soon capturing Wolmar (Valmiera) and Fellin (Viljandi, Felin). By 1602, the Swedes were only left with control of Reval (Tallinn, Talin, Rewl), Pernau (Pärnu, Parnau, Parnawa), Hapsal (Haapsalu, Hapsalu), and Dorpat (Tartu). However, Zamoyski, now 60 years old, had fallen ill and Chodkiewicz took command and laid siege to Dorpat. At Wesenberg (Rakvere), he defeated a Swedish reinforcement force under Arvid Eriksson Stålarm sent to relieve the Swedish troops in Dorpat. The town surrendered in April 1603. Chodkiewicz was appointed acting commander in chief of Lithuania forces after Zamoyski's return south in 1602 (Zamoyski would never return to lead the armies, his health deteriorated and he would die in 1605). Chodkiewicz, despite inadequate supplies and little support from the Commonwealth