The Catholic forces under Spinola or his lieutenants, meeting occasionally and accidentally with the Protestants under Maurice or his generals, exchanged no cannon shots or buffets, but only acts of courtesy; falling away each before the other, and each ceding to the other with extreme politeness the possession of towns which one had preceded the other in besieging.
The citizens of Wesel were amazed at being attacked, considering themselves as Imperial burghers.

They regretted too late that they had refused a garrison from Maurice, which would have prevented Spinola from assailing them.

They had now nothing for it but to surrender, which they did within three days.

The principal condition of the capitulation was that when Julich should be given up by the States Wesel should be restored to its former position.

Spinola then took and garrisoned the city of Xanten, but went no further.