While walking down the road, the party hears a muffled scream coming from an alley.  If the party approaches the ally a guard/soldier steps out of the shadows and tells them to mind their own business.
 

AC 16 [Chain mail]	HD 3d10+3 (22)	Init:  +2	Melee +5	1d6+2 [Light Mace]
Skills:  Listen +5, Spot +5, Intimidate +5,	Fort +5	Ref +4	Will +2	Uniform; 2 gp; 7 sp; 2 cp; Small Belt Pouch; *Signet Ring	CR  3

If a fight breaks out, a lot of noise attracts another patrol in 5d4 rounds.   If the party hangs around, the guard will try to force them to leave under threat of arrest, if they resist, he yells for aid.  If the party tries to bribe the guard, unless the bribe is significant he will likely immediately try to take the offender into custody.  Intimidation, coercion, and enchantment are always options though.

In the alley, three guards are raping a young woman.  The two holding the girl see the party and attack.
 

AC 16 [Chain mail]	HD 3d10+3 (22)	Init:  +2	Melee +5	1d6+2 [Light Mace]
Skills:  Listen +4, Spot +4, Intimidate +4,	Fort +5	Ref +4	Will +1	Uniform; 2 gp; 7 sp; 2 cp; Small Belt Pouch	CR 3

AC 16 [Chain mail]	HD 3d10+3 (22)	Init:  +2	Melee +5	1d6+2 [Light Mace]
Skills:  Listen +4, Spot +4, Intimidate +4,	Fort +5	Ref +4	Will +3	Uniform; 1 sp; 2 cp; Small Belt Pouch; 10' Help Rope	CR  3

1.    The Remaining guard takes the girl hostage and escapes (80%) during the battle.
2.    The man has killed the girl during the delay (20%) and has escaped through a side door.  He reports to his superiors that his patrol came upon the party raping the girl.  His patrol was wiped out and he fled for help and to report their identities.  The local authorities will be looking for the party now.

AC 19 [Chain mail, LargeShield]	HD 4d10+8 (31)	Init:  +3	Melee +7	1d8+3 [Warhammer]
Skills:  Listen +6, Spot +6, Intimidate +5, Bluff +6	Fort +6	Ref +5	Will +2	Uniform; 1 sp; 2 cp; Small Belt Pouch; 10' Help Rope	CR  4

• Players who "move along" as the initial guard requests gain no experience.
• Players who confront the initial guard and face other patrols gain experience for the CR of the individuals defeated.  
• PCs who bypass the initial guard via nonviolent means gain CR3 experience.
• PCs who save the girl gain CR3 experience.
• PCs who try to track the guard and his hostage to save the girl gain CR5 experience. 
• If the girl is slain and the PCs flee town, they get CR 2 experience.
• If the girl dies and the PCs stay in town to see justice is done get CR 6 experience