Meantime the destroyers _North Star_, _Phoebe_, and _Warwick_, which guarded the _Vindictive_ from action by enemy destroyers while she lay beside the Mole, had their share in the battle. _North Star_, losing her way in the smoke, emerged to the light of the star-shells, and was sunk. The German _communique_, which states that only a few members of the crew could be saved by them, is in this detail of an unusual accuracy, for the _Phoebe_ came up under a heavy fire in time to rescue nearly all. Throughout the operations monitors and the siege guns in Flanders, manned by the Royal Marine Artillery, heavily bombarded the enemy's batteries. [Sidenote: The attack on Ostend.] The wind that blew back the smoke-screen at Zeebrugge served us even worse off Ostend, where that and nothing else prevented the success of an operation ably directed by Commodore Hubert Lynes, C.M.G. The coastal motor boats had lit the approaches and the ends of the piers with calcium flares and made a smoke-cloud which effectually hid the fact from the enemy. _Sirius_ and _Brilliant_ were already past the Stroom Bank buoy when the wind changed, revealing the arrangements to the enemy, who extinguished the flares with gunfire. [Sidenote: The _Sirius_ runs aground.] The _Sirius_ was already in a sinking condition when at length the two ships, having failed to find the entrance, grounded, and were forced therefore to sink themselves at a point about four hundred yards east of the piers, and their crews were taken off by motor launches. [Sidenote: Operations cannot be rehearsed.] The difficulty of the operation is to be gauged from the fact that from Zeebrugge to Ostend the enemy batteries number not less than 120 heavy guns, which can concentrate on retiring ships, during daylight, up to a distance of about sixteen miles. This imposes as a condition of success that the operation must be carried out at night, and not late in the night. It must take place at high water, with the wind from the right quarter, and with a calm sea for the small craft. The operation cannot be rehearsed beforehand, since the essence of it is secrecy, and though one might have to wait a long time to realize all the essential conditions of wind and weather, secrecy wears badly when large numbers of men are brought together in readiness for the attack. [Sidenote: The _Vindictive_ makes for Ostend.]