Western Europe Western Europe Western Europe Western Europe Western Europe Western Europe Western Europe East Indies Western Europe European waters Americas East Indies The siege of Deventer was a siege of the city of Deventer by States troops under George van Lalaing, count of Rennenberg, from 3 August to 19 November 1578 during the Eighty Years' War.

It was besieged in an attempt by the States-General of the Netherlands to better protect the regions of Holland and Utrecht from Spanish plundering.

Since 1572 the city had been held by the German Polweiler-regiment for the Spanish Empire on behalf of Don John of Austria.

After Lalaing had put into practice a number of pieces of strategic advice from Johan van den Kornput, the city was prepared to negotiate a surrender and on 19 November 1578 handed itself over to States troops.