21.   Authorities suspect that bombings are the work of terrorists aligned with Muslim insurgents fighting federal troops in the southern Russian republic of Dagestan.

22.   A black man needed federal troops to enter the doors of the University of Mississippi.

23.   According to the statement, federal troops, assured by local leaders that guerrillas had left the area, moved into the village only to find themselves under attack.

24.   After arousing Serb nationalism he infiltrated federal troops into Bosnia in large numbers so that, when the break came, the Serbs there had an overpowering military advantage.

25.   Burns was jailed at the courthouse while federal troops were sent to Boston to ensure his return to Virginia.

26.   But human rights activists said the bodies are those of Chechen civilians executed after they were detained by federal troops.

27.   But President Dwight D. Eisenhower gained control of the Guard and ordered federal troops to be sent to Little Rock to restore order and accompany the nine.

28.   But Russian officials vehemently denied that federal troops took part in any atrocities against civilians.

29.   But the devastated neighborhoods have become a barricaded city occupied by camouflage-clad federal troops and other law-enforcement officers.

30.   But Russia may have already committed a deadly mistake by sanctioning the arming of Dagestan militias that have volunteered to help federal troops fight off the intruders.