The phrase "attack either" is grammatically correct and can be used in written English.
It can be used in contexts where you are discussing options for an attack or approach, indicating that either option is viable.
Example: "In this strategy, we can choose to attack either the left flank or the right flank, depending on the enemy's movements."
Alternatives: "assault either" or "strike either".
The two-year-old puma did not attack either of them, but did wreck the kitchen.
They are spirited, fire-snorting creatures who frequently rear up and attack either each other or the horses drawing the other chariots.
Communication was none too smart in attack either and Hughes conceded that opponents have seen enough now to devise ways of stopping them.
Paulinho and Kane had efforts when Spurs returned to the attack either side of a deflected strike from Townsend, who was booked for dissent as half-time approached.
Pogrom, (Russian: "devastation," or "riot"), a mob attack, either approved or condoned by authorities, against the persons and property of a religious, racial, or national minority.
Explicit references to the current occupants of the White House have been ruthlessly written out of this week's convention; no one is allowed to attack either of the Clintons for fear of appearing mean-spirited.
Stuart Broad decided his best chance was in attack, either side of lunch, and he succeeded briefly until his attempt to sweep Yasir had to be adapted into a curious front-foot pull when the leg-spinner pulled back his length, and the result was a routine catch at square leg.
They also enjoy a pretty good community of tools with which you attack either subject intellectually.
The popularity of cloud computing caught the attention of many hackers, allowing them to find new ways to attack either cloud services or customer's data.
Challenges to claimed multiple realizations can attack either step and, most importantly, the step challenged can differ from case to case.
