This couplet asks what new promise or pact is being referred to for a second time, and then commands foreign ships to turn back.

This couplet expresses a strong feeling of finality and a refusal to engage in further negotiations. The speaker dismisses the idea of a 'second agreement or promise,' indicating that the previous one might have been disappointing or broken. The line 'Turn back, oh ships of foreign lands!' is a powerful declaration, telling external influences or foreign entities to retreat. It reflects a desire for independence, perhaps after a previous betrayal or a failed attempt at cooperation. It's a clear message: no more talks, no more deals, just a firm request for foreign elements to depart, signaling a turning point or a decision to stand alone.