"Duke, the Austrian army is not under our command."
"Yes, Duke, I know."
Austria and the St. Istvan Crown Territory are territories of the Habsburg family, nominally not independent states, but vassals of Charlemagne, whose troops must obey Charlemagne's command in war.
This has been tacitly acknowledged by all countries, including the Papal Majesty and Castile, a cousin of Austria.
"Duke, we all know that the command of the coalition forces lies with Charlemagne. We can use the 'Marine Corps' as an excuse to avoid Charlemagne's blind command, but Austria can't."
"Yes, Duke, I know."
The command of the land forces.