stonewall (n.)

also stone wall, Old English stanwalle; see stone (n.) + wall (n.). As nickname of Confederate General Thomas J. Jackson (1824-1863), bestowed 1861 on the occasion of the First Battle of Bull Run, supposedly by Gen. Bernard Bee, urging his brigade to rally around Jackson, who was "standing like a stone wall." Bee was killed in the battle; the account of the nickname appeared in Southern newspapers within four days of the battle.

On the face of it this account has no character of authenticity, and the words ascribed to Bee smack less of the battlefield than of the editorial sanctum. ... It seems inherently probable that something was said by somebody, during or immediately after the battle, that likened Jackson or his men or both to a stone wall. [R.M. Johnston, "Bull Run: Its Strategy and Tactics," Boston, 1913]

stonewall (v.)

"to obstruct," 1889 in sports; 1914 in politics, from metaphoric use of stone wall (n.) for "act of obstruction" (1876). Related: Stonewalled; stonewalling (defined in Century Dictionary as "parliamentary obstruction by talking against time, raising technical objections, etc.," and identified as originally Australian).

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Definitions of stonewall from WordNet

stonewall (v.)
obstruct or hinder any discussion;
Nixon stonewalled the Watergate investigation
When she doesn't like to face a problem, she simply stonewalls
stonewall (v.)
engage in delaying tactics or refuse to cooperate;
The President stonewalled when he realized the plot was being uncovered by a journalist