Q: In this task, you're given passages that contain mentions of names of people, places, or things. Some of these mentions refer to the same person, place, or thing. Your job is to write questions that evaluate one's understanding of such references. Good questions are expected to link pronouns (she, her, him, his, their, etc.) or other mentions to people, places, or things to which they may refer. Do not ask questions that can be answered correctly without understanding the paragraph or having multiple answers. Avoid questions that do not link phrases referring to the same entity. For each of your questions, the answer should be one or more phrases in the paragraph, and it should be unambiguous.
Passage: On the battlefield, the king's commanders led the troops. The empire's war strategy rarely involved massive invasions; more often it employed small scale methods such as attacking and destroying individual forts. The empire was among the first in India to use long range artillery commonly manned by foreign gunners (those from present day Turkmenistan were considered the best). Army troops were of two types: The king's personal army directly recruited by the empire and the feudal army under each feudatory. King Krishnadevaraya's personal army consisted of 100,000 infantry, 20,000 cavalrymen and over 900 elephants. This number was only a part of the army numbering over 1.1 million soldiers, a figure that varied as an army of two million has also been recorded along with the existence of a navy as evidenced by the use of the term Navigadaprabhu (commander of the navy). The army recruited from all classes of society (supported by the collection of additional feudal tributes from feudatory rulers), and consisted of archers and musketeers wearing quilted tunics, shieldmen with swords and poignards in their girdles, and soldiers carrying shields so large that no armour was necessary. The horses and elephants were fully armoured and the elephants had knives fastened to their tusks to do maximum damage in battle.The capital city was completely dependent on the water supply systems constructed to channel and store water, ensuring a consistent supply throughout the year. The remains of these hydraulic systems have given historians a picture of the prevailing surface water distribution methods in use at that time in the semiarid regions of South India. Contemporary records and notes of foreign travelers describe how huge tanks were constructed by labourers. Excavations have uncovered the remains of a well-connected water distribution system existing solely within the royal enclosure and the large temple complexes (suggesting it was for the exclusive use of royalty, and for special ceremonies) with sophisticated channels using gravity and siphons to transport water through pipelines. The only structures resembling public waterworks are the remains of large water tanks that collected the seasonal monsoon water and then dried up in summer except for the few fed by springs. In the fertile agricultural areas near the Tungabhadra River, canals were dug to guide the river water into irrigation tanks. These canals had sluices that were opened and closed to control the water flow. In other areas the administration encouraged the digging of wells monitored by administrative authorities. Large tanks in the capital city were constructed with royal patronage while smaller tanks were funded by wealthy individuals to gain social and religious merit.
A:
What employed a war strategy method such as attacking and destroying individual forts?