To afford protection at a certain point in the route and to maintain the
aids to navigation during the approach and retirement of the expedition, a
force consisting of the flotilla leaders Scott and the destroyers
Ulleswater, Teazer and Stork, and the light cruiser Attentive, flying the
pennant of Commodore Boyle, was organized. This force, as it developed,
was instrumental in patroling and directing the movements of detached
craft in both directions, and relieved Admiral Keyes of all anxiety on
that score.

At the moment of departing the forces were disposed as follows:

In the Swim--For the attack on the Zeebrugge Mole: Vindictive, Iris,
Gloucester. To block the Bruges canal: Thetis, Interprid and Iphigenia. To
block the entrance to Ostend: Sirius and Brilliant.

At Dover--Warwick, flagship of Vice-Admiral Keyes; Phoebe, North Star,
Brigadier, Trident, Mansfield, Whirlwind, Myngs, Velox, Morris, Moorsom,
Melpomene, Tempest and Tetrarch.

To damage Zeebrugge--Submarines C-1 and C-3.

A special picket boat to rescue crews of C-1 and C-3.

Minesweeper Lingfield to take off surplus steaming parties of block
ships, which had 100 miles to steam.

Eighteen coastal motorboats.

Thirty-three motor launches.