Regarding the prefix 'a-' before a present participle:
- (literary ( or archaic) (used before a present participle) in the act or process of⇒ ■ come a-running, ⇒ ■ go a-hunting
He courted me, and I accepted.
Look at meaning #1 of "court" as a verb here:
http://www.oxforddictionaries.com/definition/english/court
Look at meaning #1 of "court" as a verb here:
http://www.oxforddictionaries.com/definition/english/court