Seconds Were Despatched
If a chap ever announces to you 'I demand satisfaction' or 'I shall await your seconds' he is not asking for sexual favours or indeed expecting your cast-offs. He is in fact proposing a bout of fisticuffs that could spell an untimely end for either you or he.
In order to arrange this he would expect you send your seconds, or assistants, to him to make the necessary arrangements for the unpleasantness. Thus giving all concerned ample opportunity to make amends or leave the country before eyes need be blackened or blood shed.