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The fighters are stealthed, with high dex, many have criminal background for stealth.
Wizards have low wisdom because they focus on intelligence. The AOE spells often require dex saves, and con saves... the fighters have high for both. Also, they can spread apart so only so many are targeted at once. The squishy wizards shield spells and invisibility use up valuable spell slots. The army sends waves to use up wizard spells and not die all at once... action and resource economy, and the law of probability favor the army.

Not in 5th edition Dnd.
10,000 lvl 1-2 human fighters with decent dexterity and ranged weapons... some can take the feats sharpshooter some alert, some mage slayer. Mounted sharpshooter knights get two attacks each without disadvantage at 600 ft A few can even take magic initiate for useful defensive spells. Anyway, the sharpshooters can attack the invisible mages at disadvantage, (think volley fire) at
600 ft. WITH +7 to hit. Knights can give bonuses to saving throws and such. With leadership. MATHEMATICALLY, enough lvl 1-2 fighters will auto succeed perception checks, roll high initiative scores and land attacks even with disadvantage... It's a numbers game. ARMY STOMPS.