A defender using a walking stick should immediately assume a stance that places one foot forward of the other by swinging one foot away from the attacker. This adds distance between the defender and attacker, and it sets the defender up to take an additional step backward in the event the attacker advances. The stick is not used like a sword to parry, but it is held in either the dominant hand or both hands in a position out of the attacker's reach to deliver a counter-blow.
When observing an attacker, keep your distance with your cane at the ready. Focus your attention on the part of the adversary's body that is closest to you and pay attention to his balance. While retreating, step by step, wait for the attacker to make a move. When he is most off balance, quickly strike at the portion of the body closest to you. Aim chopping blows to arms and legs, swinging with only your arms to ensure you keep your balance. Direct two-handed thrusts at the trunk or head, aiming the end of your stick at the solar plexus, the kidney, the throat or the eye. If the head is down or turned, a swinging rap to the base of the skull or just behind the ear can be disabling.
If your attacker has managed to get hold of you, then you are in a very dangerous situation, especially if he is bigger and stronger than you. Maintain your grip on the stick, and, with the other hand, secure one of his fingers and bend it backwards with all your might. This will usually relieve the grip, whereupon you can strike at the attacker's knees. This provides the best chance at immobilizing him quickly at close range so you can make your escape. If a finger is not available, kick down with your heel as hard as you can on the instep of his foot. If done correctly, this will usually cause the attacker to relinquish his grip and allow you to strike the knees or other vital targets.
While some basic techniques might save you in an emergency, there is no substitute for learning a martial art that has techniques employing sticks. Aikido is a martial arts form that does not require a great deal of athleticism, and is teachable to those who might use a cane or walking stick out of necessity. Leverage and balance are more important than strength in aikido; and it is well-suited for women, children and the elderly.