Crowds in capital N'Djamena cheer as soldiers return from front lines in tanks and armoured vehicles.
Fresh fighting in western Chad pits Libya-based rebels against forces loyal to a new military junta led by deceased President Deby's son.
The oil-rich African nation has become a key regional ally of the West in the fight against militants.
Critics of President Deby say the constitutional changes are aimed at installing a de facto monarchy. Parliament approved the changes 132-2, after most of the opposition boycotted the vote.
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