Statistics for occurrence #1 of “Helos” in book 5, chapter 20 of Polybius, Histories:
... about preparations for war; and took
secret counsel with his friends to prevent
Philip from getting safe out of the country without an engagement. Meanwhile the king had
started from the district of Helos , and was on his return
march, wasting the country as he came; and on the fourth day,
about noon, arrived once more with his whole army at Amyclae.
...