Eger is not a field battle moved in front of a backdrop of walls. In September 1552, the Ottoman armies arriving after the capture of Szolnok must turn their campaign superiority into occupation of a fortress set on a ridge, with an inner castle, an outer castle, and a dividing wall. Batteries, trenches, fascines, and galleries advance the siege by sectors. An explanation based on one continuous line would exceed the evidence.
Dobó’s garrison is vastly outnumbered but has internal passages, guns placed to cover several faces, a reserve, and workers able to repair at night. Ottoman artillery destroys walls and miners reach the approaches to the old gate; yet a breach matters only if a column can cross it, remain there under fire from within, and pass enough men through.
The assaults of 29 September and 12–13 October fail despite the openings. Between them, the accidental explosion of a powder magazine, countermines, local sorties, and defensive works change the problem. By the end, the fortress is devastated and casualty figures disputed, but the Ottoman army withdraws its machinery and leaves Eger on 17–18 October without turning the ruin into a garrison.