SKILL
Easily defeats a biker gang after his recent battle with Blockbuster which he had just recovered from (Nightwing #8)
Easily beats down a small gang of armed thugs with grace and style despite having an injuried leg (Nightwing #108)
Beats up dozens of criminals within an enclosed space while still fatigued (Nightwing #36)
Takes out several high tech armored soldiers coming to The Flash's (Wally West) aid (Flash v2 #81)
Quickly KOes a small team of well armed mercenaries with his speed and agility that are using P90 machine guns (Nightwing #142)
Defeats the Carabinieri (highly trained Italian police force) while talking on the phone (Nightwing #72)
Nightwing #133:
Takes out a small group of ninjas called the 21 Tigers
Takes out another group of Tigers and even follows them to their hideout to finish them off
Defeats Ubu plus a group of League of Assassin ninjas that have him surrounded. Afterwards, Ubu comments how his skill rivals Batman's (Detective Comics #838)
Defeats Lady Vic (swords master) & Brutale (master marksmen) quickly together (Nightwing #74)
Locked in a room with almost a dozen well armed soldiers aiming their weapons at him within close range and he still comes out unfazed beating them all (Batman & Nightwing Bloodborne)
Thrown into a platoon of 40 hostile soldiers (according to Nightwing count) by a meta human speedster clone of The Flash (Jay Garrick) he apparently beats them all (Outsiders v3 #36)
In a flashback tale as Robin, he's shown taking down two schrodinger wolf hounds that even the Justice League had a tough time against due them being usually fast and hard to hit directly (Justice League v2 #51)
Taking out multiple Wildebeests (alongside the Titans) who have been turned into real monsters and are a lot tougher than the originals in power suits according to his own words (Young Justice: Sins of Youth Secret Files & Origins)
Fights off the jokerized meta human criminals Leather, Meathead, and easily spots the real Riot then KOes him (Nightwing #62)
Being been shot by Two-Face with a bullet containing scarecrow's fear toxin, Dick imagines that he's fighting against some of Batman's deadliest rogues (who turn out to be a dozen or so of Two-Face's hired henchmen) and proceeds to put a beat down on them (Nightwing #149)
Fighting off a team of holographic contructs of well known super villains in the JLA watchtower training arena that was set to lethal force by Cyborg Superman (Superman Batman Annual #5)
BATTLE TACTICS
In his first battle as Robin, he takes out Mr. Freeze by bringing down a part of the batcave on him, KOes Poison Ivy with a rock to the head, and takes down the Joker with a sneak attack (Batman Dark Victory #13)
Takes down a mind controlled Calcutta and Charge at the sametime turning Charge's electrical meta human power against them (Nightwing #132)
Takes out Tiger Moth, Silken Spider, and Dragonfly with colorless gas bombs (Nightwing #138)
Is attacked by League of Assassin ninjas inside the batcave and takes them all out (Nightwing #152)
Ambushed by a team of super powered wingmen, he defeats them with some assistance from his wing glider (Nightwing #145)
TEAM BATTLES
Takes on a large group of League of Assassin trained ninjas alongside Damian (Robin) and Tim Drake (Red Robin) that have invaded Wayne Manor. He's the last one left standing on his team as he forced to allow the league of assassins to take both Robins captive in order to save Dragonfly, Silken Spider, and Tiger Moth in time (Nightwing #138)
Despite still being weakened from his bullet wound to his head, he battles the 99 fiends alongside Batman (Bruce) & Robin (Batman & Robin #16)
Helps out Arsenal against Arkham's inmates (Titans #30)
Comes up with a plan on the spot to subdue the powerful alien Athyns with help from Jericho (The New Titans #53)
Disarms and KOes Wonder Woman with gas while using Kid Flash and Aqualad as distractions (Teen Titans Year One #3)
Defeats a prototype model of Amazo alongside Batman (Batman #637)
Defeats a super powered android known as Paragon who has the powers of the JLA alongside his fellow Spyral agent Tiger/Agent 1 by exploiting the weaknesses of each Justice Leaguer's abilities (Grayson #8)