He was "expelled from school in 1834 for poor grades and assigned to barracks on the Polish frontier."

Official maps were drawn showing that the Polish frontiers under the first known Piast princes matched the new ones.

"I am told you have ground troops moving close to the German- Polish frontier."

"What the hell does he mean we have ground troops moving up to the German- Polish frontier?"

In 1924 you crossed the Polish frontier and entered the Soviet.

They closed the Polish frontiers and prevented the transportation of munitions of war or supplies of any kind.

They were filled with troops, moving east towards the Polish frontier.

While I had been chatting in the next car - presumably when we crossed the Polish frontier - the train must have been taken apart.

Germany would guarantee the new Polish frontiers.

The Russian forces massed along the Polish frontier were obliged to fall back in the face of the swift French advance.