Leon nodded, and his finger traced a line on the border between the Sobonitz Domain and the Southern Mountain Territory, the end of the long line reaching the Ustato Mountain Pass: "We can't compete with the undead in terms of numbers. We must find a way to establish enough fortresses with Spirit Protection Holy Towers along this defense line."
If possible, Leon even wanted to build constructions similar to the high walls of Dragon Claw Fortress or the Desolate Wall to resist the undead army. However, such enormous super projects would be a massive challenge even for Earth's industrial society of the past life. With the current Western Continent's infrastructure capabilities, slightly better than Earth's feudal era, it's clearly wishful thinking.
"This can't be done by the Holy War Alliance alone," Leon continued: "We need to persuade King Eric, and also the current rulers of Seryan; it would be best to get assistance from the Dinexion Church."