Why can't I see the amount of troops in an enemy town sometimes in HoMM 3?

Why can't I see the amount of troops in an enemy town sometimes in HoMM 3? - Police officer on bicycle standing in front of protesting crowd

Sometimes when I try to decide whether to attack the town or not I see something like this, just the icons of the units and no approximate numbers at all.

Why?

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Pictures about "Why can't I see the amount of troops in an enemy town sometimes in HoMM 3?"

Why can't I see the amount of troops in an enemy town sometimes in HoMM 3? - Black and white of young tattooed ethnic males of band in accessories and casual apparel in town
Why can't I see the amount of troops in an enemy town sometimes in HoMM 3? - Happy man with glasses smiling and standing near yellow taxi on street in city in daytime
Why can't I see the amount of troops in an enemy town sometimes in HoMM 3? - Burgman Boutique





Liz Phair - Why Can't I? (Official Video)




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Images: Brett Sayles, Khoa Võ, Tim Samuel, Igor Starkov