Various, Current History, Vol. VIII, No…
“ Six obsolete British cruisers took part in the attack. They were the Brilliant, Iphigenia, Sirius, Intrepid, Thetis, and Vindictive. The first five of these were filled with concrete and were to be sunk in the entrances of the two ports. The Vindictive, working with the two Mersey ferryboats Daffodil and Iris, carried storming and demolition parties to the Zeebrugge mole. The object was to attack the enemy forces and guns on the mole, along with the destroyer and submarine depots and the large seaplane base upon it, and thus to divert the enemy's attention from the work of the block ships. ”
