Broke into the open - Tradução em português

Olá,

Qual é a tradução da parte em negrito?

The Hrawi Government, with the aid of tens of thousands of Syrian soldiers, has moved to re-exert control over the country's territory for the first time since the spring of 1975, when tensions between X and Y broke into the open with intense clashes that heralded what turned into the Middle East's longest-running civil war.

Muito obrigado desde já.

Márcio Alexandre