Cannon 
To dream about a cannon represents that there is something pressing that you must address at the present moment. You have no time to waste or in dealing with this situation.
Shower
To dream that you are taking a shower in clear and fresh water signifies a change in your conscious or unconscious self or the desire to dispose of something unpleasant. It is also representative of your ability to grant absolution.
To dream that you are taking a shower in muddy and dirty water represents hardships and adversity.
To dream that somebody, including yourself, is showering with their clothes on indicates that the person's personality will remain unaffected no matter what they do to alter their image. In addition, your dream may imply that you feel the need to distance yourself from others to ensure your emotional safety.
Ammunition
To dream of ammunition could indicate that you are using influence and authority to convince others or keep safe. It can also mean that you are attempting to achieve your goals through devastating means.
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