> og komu þeim á flótta.
> (put them to flight?).

Yes, that's right. This is the transitive 'koma' "to cause to come, to
take, bring, carry" (Z 3) which takes a dative object to indicate the
thing or person brought.

> í móti
> in a meeting with (in opposition to)

In contexts like this, you could think of it as a composite
preposition "towards" (or, depending on the context "against").

LN