(Please read from the start)
“The Inca made many discoveries in medicine. They performed successful skull surgery, by cutting holes in the skull to alleviate fluid buildup and inflammation caused by head wounds. Many skull surgeries performed by Inca surgeons were successful. Survival rates were 80–90%, compared to about 30% before Inca times.
Coca
The Incas revered the coca plant as sacred/magical. Its leaves were used in moderate amounts to lessen hunger and pain during work, but were mostly used for religious and health purposes. The Spaniards took advantage of the effects of chewing coca leaves. The Chasqui, messengers who ran throughout the empire to deliver messages, chewed coca leaves for extra energy. Coca leaves were also used as an anaesthetic during surgeries.
Weapons, armor and warfare
The Inca army was the most powerful at that time, because any ordinary villager or farmer could be recruited as a soldier as part of the mit'a system of mandatory public service. Every able bodied male Inca of fighting age had to take part in war in some capacity at least once and to prepare for warfare again when needed. By the time the empire reached its largest size, every section of the empire contributed in setting up an army for war.
The Incas had no iron or steel and their weapons were not much more effective than those of their opponents so they often defeated opponents by sheer force of numbers, or else by persuading them to surrender beforehand by offering generous terms. Inca weaponry included "hardwood spears launched using throwers, arrows, javelins, slings, the bolas, clubs, and maces with star-shaped heads made of copper or bronze." Rolling rocks downhill onto the enemy was a common strategy, taking advantage of the hilly terrain. Fighting was sometimes accompanied by drums and trumpets made of wood, shell or bone. Armor included:
• Helmets made of wood, cane, or animal skin, often lined with copper or bronze; some were adorned with feathers
• Round or square shields made from wood or hide
• Cloth tunics padded with cotton and small wooden planks to protect the spine
• Ceremonial metal breastplates, of copper, silver, and gold, have been found in burial sites, some of which may have also been used in battle
Roads allowed quick movement (on foot) for the Inca army and shelters called tambo and storage silos called qullqas were built one day's travelling distance from each other, so that an army on campaign could always be fed and rested. This can be seen in names of ruins such as Ollantay Tambo, or My Lord's Storehouse. These were set up so the Inca and his entourage would always have supplies (and possibly shelter) ready as they traveled.
Banner of the Inca
Chronicles and references from the 16th and 17th centuries support the idea of a banner. However, it represented the Inca (emperor), not the empire.
Francisco López de Jerez wrote in 1534:
… todos venían repartidos en sus escuadras con sus banderas y capitanes que los mandan, con tanto concierto como turcos.
(… all of them came distributed into squads, with their flags and captains commanding them, as well-ordered as Turks.)”
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