Beyond the opponents, surprises always come up south of the border for the U.S. This day it was a field with grass as long as the first cut on a golf course, which made hitting crisp passes across the ground difficult.
How far (if at all) there is now a rift between Salahuddin and the Pakistan-based leadership and Dar and his commanders on the ground is difficult to gauge.
Given their inherent differences, in terms of both format and ideology, both plans are difficult to compare on level ground.
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But bacterium in ground beef is difficult to kill, even after cooking, because processing spreads it evenly throughout the product.
Hacked Off campaigner and actor Hugh Grant told BBC Two's Daily Politics that cross-party negotiations over the report had "ground into a difficult place".
Although the Iraqi government has made commitments to enshrining the rights of religious minorities in the country's new constitution, the lack of security makes these difficult to enforce on the ground.
Its Iridium satellite-based global phone system switches all calls in the sky without using any ground stations, an impossibly difficult task.
There are also rumours in the market that the Saudis are finding it more difficult to lift oil out of the ground.
But as he got older he says he noticed that he was losing ground and finding it more difficult to maintain a lean body.
"But anything in the ground, has got to stay in the ground, it is very difficult to harvest at this time of year, " he said.
Another challenge, Denbow said, is that when companies find higher ore-grade deposits, they are often far under the ground, making them more difficult and more dangerous to mine.
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With Tony Blair's troops holding much of that old ground, it is certainly difficult to see the Tories moving to the overcrowded centre, although it is perfectly possible to see a leader in the mould of ex-minister Kenneth Clarke, if not the man himself, attempting to regain that one nation territory.
Right here on the flight line in crash landings, the helicopters landing in what are called brown-out conditions, meaning the dust on the desert floor rises up and engulfs the helicopter and it is very difficult for the pilot to see the ground in those conditions and very easy to mess up the landing.
Because it is impossible to manufacture and traditionally difficult to extract and process from the ground, gold served as a stable peg for coinage and paper money issuance--but no nation operates on a "gold standard" today, as most abandoned it during the 20th century after major powers suspended it periodically during times of costly military adventures during the 19th century.
But even with teachers, getting a Chinese-language program off the ground at a high school is difficult.
Making a deal stick will be difficult if there's mayhem on the ground.
The semi-final proved to be more difficult, a poor start meant Gillings lost ground but some excellent lines at the top of the course meant she led going into the first jump and kept in going to the finish line.
In her speech at the Brookings Institute on December 10, she said the Obama administration supports Fatah's plan to build facts on the ground that will make it more difficult for Israel to maintain its control over Judea, Samaria and Jerusalem.
But Pentagon officials said it is very difficult to successfully target a single person on the ground in such a bombing.
"The recent introduction of targeted tax allowances to promote the development of a range of difficult projects, coupled with the government's ground-breaking commitment to provide certainty on decommissioning tax relief, has prompted global companies and independent businesses alike to take another look at the UK as an investment destination, " Mr Webb said.
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Yet in some markets, the supply of top-quality office and apartment buildings is nearly as difficult to grow as the amount of gold in the ground.
Manslaughter would not be difficult to prove but for Florida's "stand your ground" law.
We recognize the importance of having difficult conversations in order to build stronger communities and find common ground despite perceived differences.
But when it comes to difficult choices about our budget and our priorities, we have found common ground before.
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In winter of course healthy and sick ash trees are difficult to tell apart as the leaves will all have fallen to the ground.
Not only are their traditional markets, such as the US and Europe, shrinking, but Chinese and Russian companies, buoyed by their governments' investments, are making inroads in overseas markets, making it more difficult for companies such as Lockheed Martin and BAE to make up lost ground by selling internationally.
Now, obviously, there are going to be tensions in such a complicated, difficult environment, and a -- in a situation in which on the ground, both Afghans and Americans are making enormous sacrifices.
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Without these firms, hydrocarbons would largely stay in the ground or locked in the sea-bed, heavy manufacturing would be difficult to impossible, electricity and communications would be more episodic and primitive, and the list goes on.
But as my foot touched the ground of my beloved Pakistan for the first time after eight lonely and difficult years of exile, I could not stop the tears from pouring from my eyes and I lifted my hands in reverence, in thanks, and in prayer.
Thus, radioactive leaks through the ground, in the event of a Chernobyl-like catastrophe, would be difficult to contain.
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