And while it was still a bit difficult for a Sharonian to wrap his mind around all the advantages the Arcanans’ “dragons” bestowed upon them, one thing was abundantly clear: they could project force much farther — and much more rapidly — than Sharona could, even through totally undeveloped terrain.
This is quite apparent with Division-Captain Arlos chan Geraith's resistance to fighting it out in the Traisum Cut.
The only way Division-Captain chan Geraith is going to inflict lots of casualties at anything approaching a one to one casualty exchange ratio with an enemy with the mobility advantage that Arcanian dragon air transport provides is to fight them in their fortified ground positions, under far seer directed heavy artillery impact fans.
That is the only situation when Sharona's rail-logistics advantage in material weight can make itself felt over Arcania's dragon air transport and spell-tramways.
Arcania's military is built around direct fire magical energy weapons and dragon airpower. A defensive siege with that military kit versus Sharonan heavy indirect fire artillery and long range automatic crew served weapons is a losing proposition.
Arcania cannot win a Battle of Dien Bien Phu.
See:
en.wikipedia.org/wiki/Battle_of_Dien_Bien_Phu