The Samurai professional had only relatively short periods of time for training and thus only had time to learn a single set of skills, which needed to be transferable to many scenarios from battlefield to feudal boardroom.
Aiki the principle of not fighting but joining with the strength of the opponent was that critical skill. This skill enables one to avoid trying t the unblockable samurai sword yet harness its power. It uses the decisive one cut mindset of the swordsman in sword combant, mixed combat and in unarmed scenarios
In developing the AIki component, Morehei Ueshiba was said to have been undefeatable against armed, unarmed and multiple attackers in a period where Ronin(wandering martial artists travelled the country side)
Today Aiki practitioners rarely carry around swords, but the mindset of extending the mind beyond the body, total awareness of surrounding, the relaxed power of the sword cut can be employed as an unarmed self defence. Further the concets of joining rather than fighting prove very useful in the usual day to day conflicts of home and work place environments.
The Aikido dojo is our place to practice the martial principle of Aiki in armed and unarmed combat, developing physical combat skills based joining rather than fighting. Over time and under the stress of this regular physical conflict our understanding of Aiki passes from the physical and conscious to the mental and subconscious as a way to enhance out lives.