The vessel on the right is a 'snaauwschip' (a square-rigged two masted vessel usually employed as a despatch vessel; in English, 'a snow') flying a blue ensign with a coat of arms. In the middle distance is a man-of-war with its sails furled flying the Dutch colours. The town on the horizon seems to be Dordrecht, with the Grote Kerk on the left &, towards the right, the Groothoofdspoort. This painting was probably painted in the mid-1660s & almost certainly before about 1692-4 when the spire of the Groothoofdspoort was replaced by a dome.