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Starting with a diplomacy-focused hero and gaining access to units in the first week allowed for good development, and later, I trained another hero with diplomacy skills.
However, the units I recruited were only level 2-3, and their combat strength wasn't high. In the second week, when I encountered an opponent, I was pushed back twice by their 5 Angels, and I faced a difficult situation. Fortunately, I managed to recruit over 130 Dwarves through diplomacy, which became the main force for conquering Dragon Fort. Dragon Fort also gave me the Mage's Hat, which helped me secure the final victory.
With the Fly and Jump spells, I quickly captured another Dragon Fort, recruited a few more strong units, and after a few flanking maneuvers, I occupied their city. The opponent's forces were in a difficult situation and couldn't reinforce, so they surrendered.
tfp