the war was fought between whom?
Protestant and Catholic factions
Cologne War
The Cologne War (1583–88) was a conflict between Protestant and Catholic factions that devastated the Electorate of Cologne, a historical ecclesiastical principality of the Holy Roman Empire, within present-day North Rhine-Westphalia, in Germany. 
which years did the cologne war take place? 1583 which country did it take place? Germany
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Cologne War [SEP] Introduction
The Cologne War (1583–88) was a conflict between Protestant and Catholic factions that devastated the Electorate of Cologne, a historical ecclesiastical principality of the Holy Roman Empire, within present-day North Rhine-Westphalia, in Germany. The war occurred within the context of the Protestant Reformation in Germany and the subsequent Counter-Reformation, and concurrently with the Dutch Revolt and the French Wars of Religion. Also called the Seneschal's War or the Seneschal Upheaval and occasionally the Sewer War, the conflict tested the principle of ecclesiastical reservation, which had been included in the religious Peace of Augsburg (1555). This principle excluded, or "reserved", the ecclesiastical territories of the Holy Roman Empire from the application of "cuius regio, eius religio", or "whose rule, his religion", as the primary means of determining the religion of a territory.