These forces were to prove critical during the early days of the war.

But it has proved during tests to be very effective.

This policy line would prove fatal during the summer of 1914.

That theory was proved during the one and only trip we took together as adults.

He had proved that beyond anyone's doubt during his time with Ben.

Parking can prove very difficult during the busy summer months.

They have proved their worth as training aircraft and even during the early fighting in 1998.

Production of the new class began in 1985 after 243 001 had proven satisfactory during her trial period.

It's a format which has proved effective, and popular, during major developing stories such as those of recent weeks.

Nothing had ever been proved about Gorman's activities during the war.