The King of Portugal, moved by fear of the French, had acknowledged Philip V.; but his heart was against him, for he dreaded French influence and power brought so near his little and isolated kingdom.

It had been a part of Rooke's mission to detach him from the alliance of the two crowns; and the affair of Vigo, happening so near his own frontiers, impressed him with a sense of the power of the allied navies.

In truth, Portugal is nearer to the sea than to Spain, and must fall naturally under the influence of the power controlling the sea.

Inducements were offered,--by the Emperor of Austria a cession of Spanish territory, by the sea powers a subsidy; but the king was not willing to declare himself until the Austrian claimant should have landed at Lisbon, fairly committing the coalition to a peninsular as well as a continental war.

The emperor transferred his claims to his second son, Charles; and the latter, after being proclaimed in Vienna and acknowledged by England and Holland, was taken by the allied fleets to Lisbon, where he landed in March, 1704.
This necessitated the important change in the plans of the sea powers.
Pledged to the support of Carlos, their fleets were thenceforth tied to the shores of the peninsula and the protection of commerce; while the war in the West Indies, becoming a side issue on a small scale, led to no results.