Ring spanners - you can extend the length of a ring spanner by locking the ring of another spanner into the open end of the first. Alternatively you can user a socket and long 'breaker bar' or a handy extending socket wrench bar for removing car wheel nuts. Leverage.
Bashing a nut with hammer and cold chisel works but with some risk not only to deforming the nut but also damaging a bearing.
It's funny how terms change, a box spanner now means a tubular spanner (cheap as chips, very useful but not very strong). Back in the day a box spanner was one of these things for a bicycle.
http://images.evanscycles.com/product_i ... panner.jpg