They were only a hundred or so paces away when the psûkari began Scourging them.” “It was the Scourge they used, then?” Iyokus nodded. “I would say so. And perhaps the Lash, as well.” “So they were Secondaries or Tertiaries?” “Without question,” the Master of Spies replied, “perhaps under one or two Primaries
We now know of two battle spells from Indara's Waterbearers, a rough range for the Scourge (and the notion that it would be unusual to Scourge so closely), and an approximate breakdown of their battle rank. We think we know there are 100-120 Cishaurim, three ranks, and a battle group of 14. Unit size in wartime being famously understrength, this showing is almost certainly not standard.
The breakdown might be 10-3-1 tertiary-secondary-primary as it feels unlikely the school would spend a full tenth of its strength without a sorcerer of the first order present.

