Erinauman contractors have the green light. Normally, I'd oppose to us taking such huge jumps as internal combustion engines, but since it's just us now, I say we skip all this and move on to star cruisers and plasma weapons I'll go along with it.
The large barbarian force has breached the section of the all enclosing wall, as it was tragically undermanned, and too few reinforcements could arrive in time. Up to a quarter of the standing Rossiyan military has been destroyed, as isolated contingents were overwhelmed by the sheer number of barbarians. The remainder of the Rossiyan armies are congregating around the Rossiyan political capitol. Avalonian and Aemilian troops are joining them, swelling their numbers to over 2 million.
Avalonia believes that the invasion is a result of subversives in the form of ex-rulers of the Slaintean government, aided by barbarian tribes opposed to the cbrown town, and the far side tribes that invaded the Avalonian colony a while back. Aside from that there are plenty of other tribes that have had no contact with Avalonia and could be easily swayed to attack Avalonia.
Erinaum sends reinforcements of 400000 foot soldiers, 200000 Archers, 100000 Horsemen, 50 squadrons of Åøßáñæ Catapults and 50000 men carrying primitive guns (Much like the Yuan Gun). We will push through their rear lines like a stone plunges into the sea. They will be defenseless in this tight pinch.
And they're
External Combustion engines, which means steam trains. The internal combustion engine and the discovery of oil are far off.