this is an example of the verb 'walk' used intransitively

He wore about his shoulders a heavy cloak; his pale face was drawn and his voice broken with rheum.

'Safe? Fiddlesticks! There is no safe. Mr Lavington is an intelligent man. You will see, he will have devised a hiding-place much more intelligent than a safe. A safe is the first thing everyone looks for.'

Thus he concludes, and euery hardie knight / His ſample follow’d, and his brethren twaine, / The other Princes put on harneſſe light, / As footmen vſe.