For a city to withstand an attack you need a layered approach. First, put thick, high walls at the perimeter with limited, easily defendable gatehouses – fewer entry points, each fortified with murder‑holes or trap‑doors. Second, design a grid of internal boulevards that are wide enough for patrols but narrow enough that enemies can’t spread out. Add a series of secondary walls or ramparts inside the main walls; these act as kill‑zones and give defenders a fallback. Third, insert hidden exits and tunnels that only the defenders know – useful for escape or to launch counter‑attacks. Fourth, keep every entrance guarded by a choke‑point: a narrow bridge, a low arch, or a ditch that forces attackers into a single line of fire. Finally, make sure you have clear sightlines from all major defensive positions – no blind spots. If you balance these elements, the city will be tough to take and easy to hold.

Great plan, but remember to keep the walls thick enough that even a battering ram can’t break through quickly, and make the choke‑points wide enough for archers yet narrow enough for cover. Also sketch the hidden exits with clear marking so your own troops can navigate them without getting lost. Once the details are nailed down, the city will be a fortress, not just a building.

Nice, the double‑thick stone will hold a siege, and the angle‑optimized gates give your archers a clear line of fire. Just double‑check the tunnel intersections so the signposts don’t confuse the defenders under stress. If the layout stays tight, the city will feel like a living shield.