Between 11:30 and 12:45 IInd Army units cross the border. Meanwhile the GUEs vanguard arrived at 13:00. Reporters found a 10 km stretch littered with vehicles from ambulances to tanks and machine gun nests on the hills. The 1st and 3rd Batteries of the GEsA arrived at 14:00. There were more legalist forces in the highway further away.

Zerbini came with Aluísio and the the 2nd Mech Recon. The squadron was poorly employed, kept in the back instead of forward. At the Academy Zerbini was called for coffee, dragged to the elevator, brought before Médici and forbidden from leaving the building.

The frontline was established. The cadets were entrenched on the almost bottleneck between Resende and Barra Mansa. The surrounding land is hilly, with poor roads.
Captain Ferrari, of the AMAN's infantry, thought the enemy's advance would be delayed by all the obstacles and the bridge destruction would force it into the surrounding terrain. Captain Ferraz of the artillery thought he'd be massacred. All his artillery was expecting to do was to lob shells at whatever came immediately in front of him on the road.

Colonel Aldo stops his artillery group and conferences with his commanders. They are finally informed of their enemy - the Academy - and their mission - support the Infantry School-Regiment against it. Seixas or Brunner is astonished:
-You'll fire at cadets?
-We're soldiers and received an order. It is legal, the mission exists, and we must fulfill it. It's a bitter mission, but that must be fulfilled.

Instead, Seixas, Brunner, da Silveira and Graça decide to defect under Seixas' leadership. It bears noting that he and the two battery commanders studied at the Academy.
It'd have to be a fast and unannounced movement as they'd pass right through the infantry and the 2nd Battery, which from high ground could easily mow them down from behind. There was no coordination with those. Further, they could face opposition from within their batteries.
In the 3rd Battery Captain Graça asked his Firing Line commander, 2nd Liutenant Pizzoti, if his officers would follow him. "I drag them". The sergeants, however, were politically unreliable and had to be kept without ammunition. In each vehicle, besides the driver and sergeant there'd be an officer. And finally, the sergeants would have to be told it was a reconnaissance.
"But that'd be hard to hide, recon with all personnel! They'll suspect."
"Your problem, figure it out."