The phrase "armed hostility" is correct and usable in written English.
It can be used to describe a situation where there is aggressive or violent behavior involving weapons.
Example: "The region has been plagued by armed hostility, leading to numerous casualties and a humanitarian crisis."
Alternatives: "militant aggression" or "violent confrontation".
He also said the constitutional requirement to protect the states from invasion was designed to guard against "armed hostility" from abroad, not immigration.
After the CPA is signed, however, armed hostility may cease, thus facilitating the return of internally displaced persons (IDPs) and refugees.
For some it may mean an end to armed hostility and opportunities for formal government power.
And said that in the face of armed hostility the security services had no choice.
More important than armed hostility was the improvement of the international climate in bringing down the Wall.
If armed hostilities erupt, President Obama should be prepared for direct and close consultations with Chinese leaders to negotiate a postwar settlement, in a larger multinational framework, that respects Beijing's legitimate security interests in North Korea.
The Hoa Hao, along with the syncretic religious group Cao Dai, was one of the first groups to initiate armed hostilities against the French and later the Japanese colonialists.
Accordingly, he stopped armed hostilities with the Republic and turned the state prisoners back over to his erstwhile coalition partner, the Habsburg Austrian monarch Francis II, Holy Roman Emperor.
Armed hostilities during the Black Hawk War began at Stillman's Run and the victory was unexpected for Black Hawk and his British Band.
Armed hostilities in Gaza come at a time when children would normally be enjoying their summer vacation.
After a CPA is signed, armed hostilities cease and former warring groups gradually return to normal activities, a different result than with a decisive government or rebel victory.
