The phrase "conclude peace" is correct and usable in written English.
It is generally used as a verb phrase meaning "to come to an agreement or settlement". For example, "The two sides finally concluded peace after decades of conflict."
The strike by Sweden forced Denmark to leave the alliance and conclude peace.
He also forced Athens to conclude peace and to acknowledge the independence of its rebellious allies (355).
But some Israeli experts and officials have suggested that despite his hawkish reputation, he could turn out to be a leader who may also conclude peace with the Palestinians.
The British government wanted to conclude peace in 1864, but the colonial government, wishing to acquire more land, continued the war and assumed an increasing share of the fighting.
After Michael had suppressed the insurrection, however, Krum offered to conclude peace, but the terms offered seemed unacceptable to Theodore Studites, and on his advice Michael declined the proposal.
Meanwhile, Ṭahmāsp had rashly attacked the Turks while Nadr was absent quelling a revolt in Khorāsān, but the shah was heavily defeated and was forced to conclude peace with the Turks on ignominious terms.
In 1920 the Soviets concluded peace treaties recognizing independent Baltic states.
Austria concluded peace immediately (Treaty of Pressburg, December 26 , 1805, while Russia continued the war.
On his father's death, after acceding as Khosrow I (531 579), he concluded peace with the Byzantine emperor Justinian (532).
The government of Sudan is well on its way to concluding peace with southern rebels, following prodding by the United States.
In 1449 Milan concluded peace with Venice behind Sforza's back, whereupon he blockaded the city, starving it into insurrection.
