Perdiccas (who was already betrothed to the daughter of Antipater, Nicea) attempted to marry Alexander's sister, Cleopatra, a marriage which would have given Perdiccas a claim to the Macedonian throne. Antipater, Craterus and Antigonus formed a coalition against Perdiccas's growing power. Antipater sent his army, under the command of Craterus, into Asia Minor. This was the beginning of the first of the Diadochi Wars. Menander, Asander and Ptolemy joined them in rebellion against Perdiccas. The actual outbreak of war was triggered by Ptolemy's theft of Alexander's body, and diversion of it to Egypt. Although Eumenes defeated Craterus at the battle of the Hellespont, it was all for nought, as Perdiccas himself was murdered by his own generals Peithon, Seleucus, and Antigenes during the invasion of Egypt (after a failed crossing of the Nile).