Before Athens suffered Bodily_harm defeat Conquering at Delium in 424 BC , Sparta had sent Sending an expedition under Brasidas to assist Perdiccas II of Macedonia and other opponents of Athens .

After the initial joint Illyrian and Lyncestian attack Attack was repulsed Defending , they pursued the Macedonians and blocked Hindering Brasidas ' route at a pass , forcing his army up the surrounding hill and into Macedonia .

This brought Causation to a head the quarrel Quarreling between Brasidas and Perdiccas .