Lithuanian hetman Jan Karol Chodkiewicz and Polish chancellor Jan Zamoyski, recalled from Moldavia, arrive in Lithuania in 1601 to fight the Swedish incursion, which now threatens not only the Estonia promised by Sigismund, but older Polish territories south of it.
Chodkiewicz and Radziwiłł defeat the Swedes in the first major open battle of this war at Kokenhusen (modern Koknese) in June 1601.
Soon afterwards, Zamoyski, fresh from his victory against the Moldavians, comes in to help against the Swedes, with twelve thousand men, and fifty artillery pieces, fifteen of which are classified as heavy.
Charles is unable to deal effectively with such an army and is forced to retreat.
However, during the retreat he leaves sizable numbers of defenders at various captured fortresses in Livonia.
