One paragraph needs to change:
>Coupists in the Navy immobilized the “people’s admiral” Aragão’s marines. Hence Âncora told him his remaining muscle in Rio, the Army Police and Presidential Guards, couldn’t ensure his safety in Guanabara. Rio’s garrison was still in quarters, under legalist control but perhaps neutral. Attempts to persuade units failed, and forceful takeovers were deemed too risky. The rebellion consisted only of governor Carlos Lacerda, his police, the military schools in Urca and the Copacabana Fort.

To:
>>Coupists in the Navy immobilized the “people’s admiral” Aragão’s marines. Hence Âncora told him his remaining muscle in Rio, the Army Police and Guards Battalions, couldn’t ensure his safety in Guanabara. Rio’s garrison was still in quarters, under legalist control but perhaps neutral. Attempts to persuade units failed, and forceful takeovers were deemed too risky. The rebellion consisted only of governor Carlos Lacerda, his police, the military schools in Urca and the Copacabana Fort.

Those weren't Presidential guards.