Colombia's President Alvaro Uribe has sacked four top army generals for reportedly disagreeing with reforms within the military.
The generals were all critics of plans to improve co-operation between the different branches of the armed forces.
The move comes as Marxist rebels have stepped up their attacks in the south-west of the country.
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The internal battle within the army is - as always - about power, the BBC's Jeremy McDermott in Colombia says.
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Instead of engaging in their trademark hit-and-run attacks, the rebels this time have stood and fought, leaving the army struggling to respond, our correspondent says. BBCSo, is it up to Colombians to win in Colombia too?