In en-garde, commissions may only be purchased in Paris on the weekend. Instead of using weekend leave, can commissions be purchased using a servant or intermediary in Paris while remaining on campaign? Intermediaries can enact all weekend activities except those requiring your actual physical presence (such as proposing to your mistress). Does purchasing a commission require physical presence?
Commisons may be purchased at any time
Section K says:
This suggests that you absolutely can have people "take care of this for you."