DISCLAIMER: I do not own Hellsing or Devil May Cry.

Dante and Alucard stepped out of the private jet, looking out at a darkened street. As Dante started to move forward, Alucard gripped his shoulder.
"There's vampires and demons here."
Dante sniffed the air, nodding. "Yeah. Stinky reptiles and walking corpses. I can smell dead crap and I can smell demons who stink like mouldy lizards."
Alucard shrugged. "I know they're here because I can feel them. The five human senses are so… Limited."
Dante shrugged. "At least we don't walk around in stupid hats, and I don't think I could handle looking in the mirror and seeing a dead guy with huge teeth."

The demons and vampires stepped out, cutting off any further banter between the two hunters. Alucard was the first to react, pulling out his gun and shooting one of the vampires, tearing its head apart. Dante charged forward with his two guns, shooting vampires and demons, having a surprisingly deadly effect on the vampires, killing each with a few swift shots by lining up the bullets so they actually smashed the vampires' heads. This would never have been possible if not for his apparently limitless supply of ammunition.

Alucard watched as Dante killed the demons with a mixture of his guns and sword. Alucard shot the occasional demon or vampire, but generally Dante had the monsters all covered. Alucard couldn't help but be impressed. This young man was still no match for Alucard himself, though Alucard suspected he just might be later in life, but there was no doubt that Dante was stronger even than the Captain of the Last Battalion. Alucard suddenly flashed forward, cleaving a vampire in half with his hand and pointing his gun straight into a demon's face, shooting its head off.

As the two hunters tore the demons apart, leaving piles upon piles of dismembered corpses, Walter stood in the shadows, holding one of the vampires around the neck with his wires, before decapitating the vampire with a simple flick of his wrist. Walter was impressed with this young man's speed and power. He was certainly stronger than any vampire, but Walter was unsure if saying he was stronger than the Captain was accurate. Either way, Walter was interested in having a round with Dante, though he knew that his true wish was to defeat one of the higher demons Alucard had told him about. Dante was only the beginning. He remembered the names of several of the highest demons. Mundus, Argosax, Abigail and Sparda, to name a few who had stuck in his head more than the rest.

Walter stepped from the shadows, sweeping his wires across the darkened street and cleaning up a large group of vampires with that one swipe. Dante looked at Walter, still holding up a vampire by the neck. Dante felt the vampire hit him, and returned his attention to it just long enough to punch its head off before dropping it and turning his attention to Walter, who was swirling wires around himself.
"My name is Walter C. Dornez. You, Mister Dante, interest me somewhat."
Dante shrugged. "Sorry, dude, but you're not my type. I prefer mine with longer hair, higher voices and curvier bodies, if you catch my drift."
Walter chuckled, before sweeping the wires at Dante, who blocked them by catching them on his sword and holding them in place. A brief struggle happened, before Walter unfurled the wires, jumping back and reclaiming the wires while Dante stood fast, sword at the ready. Off to the side, Alucard chuckled.
"Children…"

Dante drew his guns and started firing, prompting Walter to block the shots with his wires before swinging the wires at Dante, while Dante dashed forward with his sword. The two swept across each other, and a cut briefly appeared on Dante's face, vanishing in an instant, while Dante's fist sent Walter skidding back. Walter dashed at Dante, diving past him and swirling the wires in what most would consider a deadly attack. Walter stood in a crouched position, gripping his wires with both his teeth and fingers.
"I believe I got you, my boy."
"No, you didn't. I can get you pretty much any time I like though."
Walter spun around to see that his wires were twined harmlessly around Dante's sword, which Dante had stabbed into the ground, and that Dante's gun had been pressed right into the back of Walter's head. Walter swept the wires at the gun, and was shocked when Dante briefly pulled the gun out of the way before putting it back in the way, allowing the wires to wrap around the gun, to a horrifying lack of affect. The wires failed to scratch the gun, though Walter could hear the two metals straining against each other.

Dante flicked his wrist down, pulling Walter to himself and catching him, holding him up.
"These guns are made of a demon alloy designed specifically not to break when I shoot 'em too fast. I've blocked swords and stuff like that with them before, so your fishing lines are more of the same."
Walter scoffed. "Fishing lines?! Excuse me…"
Alucard suddenly appeared beside them, punching Dante hard enough to make him drop Walter. Alucard's arm shattered landing the punch, but instantly grew back.
"Nice to see you two have met. Let's not forget we're here to kill the demons, not each other."

Analysis:

Even in the manga and early DMC3, Dante was already wielding Ebony and Ivory, and we see in the anime that he uses one of his guns to block a sword strike from Modeus, and we do know that his guns are specially made because all the guns he used before them broke due to him pulling the triggers either too fast or too hard. Put simply, we can clearly see that Ebony and Ivory are designed to survive demonic strength and that this structural strength allows them to block blades.

Now onto Dante's advantages. Dante wasn't Mach 10 until after his awakening in DMC3, nor did he possess any time control yet, but he was already fast enough to match Vergil blow for blow, which means he probably wasn't too much slower, although it's possible Vergil was holding back. However, he was fast enough to block falling raindrops, and while that's not too different from speed feats performed by Alucard and the Captain, it instantly surpasses human Walter.

Dante was also strong enough to at least hold Vergil off, although it would be a stretch to assume Vergil possesses the massive strength Dante displays against the Saviour, so we can't really say his strength is that high at that point, considering we know for a fact he is far stronger in DMC4, one piece of proof being the fight with Mundus, since we know Vergil was no match for Mundus' astral avatar, meaning DMC3 Dante could forget about winning a fight with Mundus' true form. However, unawakened Dante was shown to already be far stronger than demons like Cerberus and Agni and Rudra, which means he was already a match for enemies like the Captain. While the Captain would pose a challenge to him at this point, human Walter is outclassed by Dante, even Pre-Awakening.