Two male cats are frequently fighting right in front of the entrance to my narrow city garden [5 feet wide]. For details see inside.

My male cat, Jacky, died in 2009. These two cats [a tuxedo from down the street and a marmalade from up the street] fight in front of the narrow garden opening and have for at least 6 months, maybe longer. The garden is unfenced, having only a border of low planters, which my female cat occasionally climbs over to venture outside, but the two male cats do not venture inside. My female cat, Jilly, may be protecting her turf but she is also frightened and frequently runs inside.

Are they fighting over their new borders since Jacky is dead? Is Jacky’s home the central division point for the turf of the down-street cat and the up-street cat? Will either try to invade Jilly’s turf now that Jacky is gone? Will they ever stop fighting and howling outside my window at 2 am?

Anybody know anything about this?