Warsaw Pact. 1955-91. USSR, Bulgaria, Czechoslovakia, E Germany, Hungary, Poland, Romania. Treaty for the combined defence of Eastern Europe under Soviet supreme command.

Warsaw Uprising. 1830-1. Czartoryski attempt to oust Russians crushed. 1944. Polish underground army defeats Germans but Soviet delay allows German reinforcements to defeat Poles, destroying potential opposition to later Soviet control.

Wattignies, Battle. 1793. Inexperienced French army defeats professional Austrians. French Revolution.

Witt, Johan de. 1625-72. Dutch statesman. Rebuilt navy. Led Dutch Wars. Triple Alliance 1668. Treaty of Aix-la-Chapelle. Killed by Orangist mob.

XYZ Affair. 1797. US attack French ships after refusing to bribe ministers. Settled 1800. French Revolutionary Wars.

Yakima Indian Wars. 1855-8. Indians resist move to reservations. Defeated by US troops.

Zama, Battle. 202BC. Rome defeats Hannibal near Carthage. Punic Wars.

Zeebrugge, Raid. 1918. Allied attempt to block harbour, trapping German submarines, warships.

Zwingli, Huldrych. 1484-1531. Swiss humanist and religious reformer. Zurich Reformation 1522. Urged priests to marry. Attacked Roman mass and worship of images. Swiss Evangelical Church. Killed in Kappel Wars.