Hello! The answer is yes, they arrive on time. The Athenians after their victory marched back to Athens. They arrived in time to prevent the landing of the Persians and with this, Datis was forced to return home. Although the Athenians and the platenses had obtained a great victory, they had not really won the war.
"for" "and" "when" http://www.marshall.k12.il.us/data/webcontent/245/file/realname/files/List-of-Conjunctions.pdf - Try using this, it'll help. It gives a list of conjunctions.
