Having captured the birds such as the vulture, crow, naptri, bhása, parrot, máina, and pigeon which have their nests in the fort-walls, and having tied to their tails inflammable powders (agniyoga), he may let them fly to the forts. If the camp is situated at a distance from the fort and is provided with an elevated post for archers and their flags, then the enemy's fort may be set on fire. Spies, living as watchmen of the fort, may tie inflammable powder to the tails of mongooses, monkeys, cats and dogs and let them go over the thatched roofs of the houses. A splinter of fire kept in the body of a dried fish may be caused to be carried off by a monkey, or a crow, or any other bird (to the thatched roofs of the houses).