Which preposition to use with bridgeheads

at Occurrences 4%

At Palazzon the river was broad and, under fire, unbridgeable, and we went half a mile down stream along what up to this morning had been our front line trench, to the bridgehead at Lido Island.

to Occurrences 2%

RANDALL, L, V. Bridgehead to victory; plans for the invasion of Europe.

by Occurrences 1%

In the treaty the occupation of the left bank of the Rhine and the bridgeheads by the allied and associated powers for fifteen years was introduced as a compromise.

on Occurrences 1%

The mortality on both sides was described as frightful, but the Russians continued to make headway and the capture of thousands of Teutonic prisoners was of almost daily occurrence, the total reaching 172,000 before June 18. Czernowitz, the capital of Bukowina, fell into the hands of the Russians at midnight of June 17, after the bridgehead on the Pruth river had been stormed by the victorious troops of the Czar.

over Occurrences 1%

William sat down with the air of one who has established a thumping bridgehead over his Rubicon and wrote to the Brigadier direct and as follows: "SIR,I have the honour to hope that this finds you a good deal better than it leaves me at present.

Which preposition to use with  bridgeheads