i've been finding that a simple shift+3 on a grouped selection of hastati/principes sets them up in a fairly effective 2 line formation, excellent for the second line to pepper javelins over the heads of the front line, as they (the front line) engage with the enemy. doesn't always work, and can lead to some envelopment, but is a fairly standard formation for me, with archers behind and cavalry flanking.
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